1,159,209 Goddard (self) Method of and apparatus for 1915
producing electrical impulses
or oscillations

2,019,481 Applegate High frequency modulation 1935
system

2,081,904 Applegate Sound transmission and 1937
reproduction

2,099,671 Bairey Antenna system 1937
Antenna tower obstruction lighting by putting reflectors on the
tower and illuminating with lights on the ground.

2,133,410 Wirkler Distortion reducing system in 1938
modulated amplifiers

2,142,999 Craft Oscillation system 1939

2,145,895 Samuelson Control circuit for shaft 1939
positioning system

2,150,362 Collins Control circuit for signal 1939
transmitting and receiving
apparatus

2,155,404 Craft Amplifier circuit 1939

2,164,309 Collins Shaft-positioning device 1939

2,165,226 Collins Automatic tuning system and 1939
apparatus

2,168,326 Collins Automatic tuning system and 1939
apparatus

2,173,095 Byrne Telescoping vertical radiator 1939
and method of errecting the same

2,173,145 Wirkler Single side-band transmitter 1939

2,174,552 Collins Automatic tuning apparatus 1939

2,175,174 Bessemer Dynatron oscillator system 1939

2,182,790 Craft Distortion reducing system for 1939
grid-modulated amplifier

2,186,958 Collins Distortion reducing system for 1940
suppressed carrier transmission

2,191,454 Craft Distortion and carrier shift 1940
correction system.

2,193,801 Byrne Signal receiving system 1940

2,198,604 Everitt Antenna system 1940

2,204,571 Byrne Voltage regulation system for 1940
vacuum tube amplifers

2,204,578 Davis Transmission control system 1940

2,204,726 Davis Limiting amplifier control 1940
means

2,206,882 Davis Electrical control apparatus 1940
construction of a step potentiometer

2,210,968 Wirkler Split side band amplifier 1940
circuit

2,211,040 Wirkler Single Side Band amplifier 1940
circuit

2,252,699 Byrne Azimuth radio beacon system 1941

2,269,126 Pieracci Frequency modulation monitor 1942

2,283,241 Van Cott Limiting amplifier 1942

2,285,414 Collins Control system and apparatus 1942

2,285,415 Collins Motor control system 1942

2,301,907 Pieracci Frequency modulaton distortion 1942
correction system

2,304,134 Wirkler Frequency comparator 1942

2,313,048 Byrne Broadcasting system 1943

2,327,382 Wirkler Frequency modulation system 1943

2,348,222 Olson Tap switch 1944

2,359,334 Smith Electric temperature indicator 1944

RE 22,574 Collins Control system and apparatus 1944
reissue of 2,285,414

2,372,243 Wulfsberg Volume limiter circuit 1945

2,378,941 May Locking bar stop means 1945

2,383,984 Oberweiser Zero phase shift selective 1945
amplifier

2,391,470 May Automatic tuning apparatus 1945

2,393,353 Wirkler Method and apparatus for medium 1946
high frequency direction finders

2,393,856 Collins Calibration system for radio 1946
receivers

2,396,714 May Shaft positioning apparatus 1946

2,408,118 Wirkler Azimuth radio direction finding 1946
system

2,408,119 Wirkler Heterodyne radio direction 1946
finding system 

2,408,120 Wirkler Radio direction finding system 1946

2,408,121 Wirkler Direction finding system with 1946
frequency shift

2,408,122 Wirkler Heterodyne direction finder 1946
with single receiver

2,409,192 Collins Tuning device clutch 1946

2,411,166 Olson Frequency multiplier 1946

2,423,824 Beetham Inductive tuning 1947

2,423,838 May Keying relay 1947

2,430,809 Flora Fastening device 1947
a metal strain-relief grip for parallel-conductor power cord

2,436,172 Kent Automatic tuning control for 1948
radio systems and the like

2,444,840 May Automatic tuning controls for 1948
radio apparatus and the like

2,445,161 Vogel Frequency sub-dividing system 1948

2,445,663 Doelz Automatic frequency control 1948
system

2,445,664 Doelz Multi-frequency generating and 1948
selecting system

2,445,700 Vaughn High-frequency tuning unit 1948

2,447,490 Collins Radio transmitting and 1948
receiving system

2,449,079 May Tuning device ratchet 1948

2,449,178 Sansbury Step-by-step automatic tuning 1948
control

2,453,451 Moseley Voltage regulator system 1948

2,457,134 Doelz Radio system for transmission 1948
and reception on the same frequency

2,458,282 Maki High power permeability core 1949
inductance

2,459,208 Wulfsberg Modulaton control system 1949

2,462,639 Hubbard High-frequency resonator 1949

2,463,402 Maki Frequency shift carrier system 1949

2.464,708 Moseley Automatic recorder 1949

2,466,776 May Automatic shaft controlling 1949
apparatus

2,467,422 Bruene Automatic radio control 1949
apparatus

2,468,071 Hunter Tuning apparatus with straight 1949
line characteristic curve

2,469,941 Abrams Tuning control and band 1949
switching arrangement

2,470,567 May Selective control apparatus 1949
for radio systems and the like

2,472,230 Reinschmidt Rotary electrical switch 1949

2,472,979 May Semiautomatic tuner device for 1949
radio apparatus and the like

2,475,065 Vogel Frequency selection circuit 1949

2,476,673 May Shaft positioning control 1949
system

2,476,840 Colander Direct reading multifrequency 1949
generator

2,476,897 Myhre Automatic motor-controlled 1949
resonating system

2,477,115 Clark Membrane type electron tube 1949
analogue device

2,477,434 Wirkler Radio direction finding 1949

2,484,638 May Selective control device for 1949
radio apparatus and the like

2,484,639 Moseley Frequency and speed stabilizing 1949
system

2,484,662 Wetzel Automatic acoustic control for 1949
public address systems and the like

2,487,857 Davis Channelized high-frequency 1949
signal receiving system

2,489,064 Vogel Automatic resonating control 1949
system

2,489,436 Salisbury Method and apparatus for 1949
producing neutrons

2,490,943 Bruene Dual microphone system 1949

2,492,324 Salisbury Cyclotron oscillator system 1949

2,492,392 Moseley Remotely tuned radio apparatus 1949
and the like

2,502,396 Vogel Automatic control of radio 1950
transmitters and the like

2,504,998 May Shaft positioning apparatus 1950

2,505,511 Vogel Remotely controlled antenna 1950
tuning and loading system

2,509,045 Salisbury Ultra high frequency radiation 1950
indicating system

2,509,216 Davis Power supply unit 1950

2,509,231 Hunter Oscillator 1950
sealed P.T.O. esp. for use in aircraft to prevent frequency
variation caused by humidity changes

2,509,952 Bachmann Frequency indicating and 1950
counting arrangement

2,509,963 Collins Radio receiving and frequency 1950
conversion system
for aviation VHF band

2,510,171 Clark Filament mount for high power 1950
tubes

2,511,586 Hubbard Ultra high frequency tuner 1950
arrangement

2,512,664 May Shaft positioning apparatus 1950

2,516,181 Bruene High-power audio frequency 1950
amplifier

2,516,704 Kohl Vacuum gauge of the ionization 1950
producing type

2,524,886 Colander Temperature control of 1950
electrovibratory systems

2,527,125 Giacoletto Two-way amplifier 1950
with a switch controlling direction of transmission

2,530,000 Couillard Automatic volume control 1950
arrangement

2,531,065 Livingood Apparatus for changing the 1950
ion source of a cyclotron

2,531,935 Doelz Level-stabilized modulated 1950
carrier amplifier

2,533,398 Pyle Selective shaft postioning 1950
control

2,533,900 Shanklin Antenna 1950

2,534,073 Sherwood Modulation protective 1950
arrangement

2,536,070 May Shaft positioning apparatus 1951

2,537,972 Davis Radio communication 1951
transmitting and receiving combination

2,542,478 Clark Electric field mapping device 1951

2,543,523 Couillard Noise control arrangement for 1951
radio receivers and the like

2,546,980 Collins Shaft positioning apparatus 1951

2,546,981 Craft Pulsing circuit 1951

2,548,278 Wirkler Aircraft course stabilizing 1951
means

2,550,693 Hart Torque meter 1951

2,560,558 Davis Radio transmitting and 1951
receiving combination

2,572,512 Pappenfus Frequency-shift keying system 1951

2,572,964 Wulfsberg Differential tuning mechanism 1951

2,576,135 Moseley Radio controlled pilot system 1951

2,578,154 Shanklin Radiant energy antenna 1951

2,579,092 Rockwell Intermittent translational 1951
device

2,580,148 Wirkler Antinoise carrier receiving 1951
system

2,582,270 Olson Control apparatus 1952

2,585,955 May Shaft positioning device 1952

2,589,076 Hancock Folded delay line 1952

2,591,012 Salisbury Electron tube of the high- 1952
frequency and high-power type

2,597,752 Salisbury Thermoelectric power generator 1952

2,599,381 Gerks Axis converter 1952

2,599,394 Kohl Assembly device for resnatron 1952
filaments

2,599,395 Kohl Filament temperature 1952
compensating system

2,599,889 Biggs Computer device for navigation 1952
systems and the like

2,599,896 Clark Dielectrically wedged biconical 1952
antenna

2,599,944 Salisbury Absorbent body for 1952
electromagnetic waves

2,602,159 Wirkler Frequency modulation generator 1952

2,604,965 Schweighofer Automatic shaft positioning 1952
apparatus

2,605,357 Salisbury Power divider circuit 1952

2,606,287 McCoy Linear sweep generator 1952

2,611,893 McCoy High-speed slewing 1952

2,614,218 Hancock Timing device 1952

2,615,958 Phillips Impedance-matching and 1952
standing wave ratio measuring system

2,615,981 Doelz Electromechanical filter 1952 

2,617,313 Schweighofer Shaft multipositioning device 1952

2,617,960 Kohl Resnatron filament basket 1952

2,617,985 Collins Frequency control system 1952

2,621,425 Heald A/N Range system simulator 1952

2,622,145 Kennedy Identification keyer 1952

2,622,195 Smith Timing circuit 1952

2,629,081 Hubbard High-frequency inductor 1953

2,630,996 Lauther Chassis fastening means 1953

2,634,372 Salisbury Super high-frequency 1953
electromagnetic wave generator

2,635,213 Bruene Time delay circuits 1953

2,635,226 Harris Phase modulation system and 1953
apparatus

2,637,779 Craiglow Crystal filter circuit 1953

2,637,787 Price Transmission line switch 1953

2,637,815 Shanklin Combination localizer and 1953
swamping antenna

2,637,820 McCreary Current integrator 1953

2,637,845 Craiglow Random signal generator 1953

2,639,397 Clark Vacuum gaube of the ionization 1953
producing type

2,639,410 Harris Multichannel telemetric system 1953

2,639,422 Harris Forward radar echo-ranging 1953
method and system

2,641,709 Stover Frequency correction device 1953

2,641,733 Harris High-frequency tube 1953

2,645,321 May Automatic tuning control for 1953
radio apparatus and the like

2,645,719 Bucksbaum Automatic tuning circuit 1953

2,648,166 Fisher Internal lathe burner 1953

2,648,728 Bollhoefer Momentary switch 1953

2,648,779 Kohl Radiation detector 1953

2,648,800 Corbell Double parallel plane magnetron 1953

2,648,825 Eberhardt Variable intermediate frequency 1953
transformer
2,650,458 Wallace Disk edge deburring machine 1953

2,650,638 McPhee Metal-to-ceramic seal 1953

2,650,974 Hime Potentiometer 1953

2,652,492 Shanklin Dipole antenna and feed 1953
arrangement therefor

2,655,811 Behrens Device for limiting rotary 1953
motion

2,656,480 Corbell Filament tensioning device 1953

2,656,497 Schweighofer Shaft positioning system 1953

2,656,516 Doelz Filter using transverse 1953
supporting means

2,659,000 Salisbury Variable frequency cyclotron 1953

2,659,879 Pappenfus Recognizer circuit 1953

2,662,422 McGowan Speed reducer 1953

2,662,944 Carney Information-storing device 1953

2,662,990 Kohl Resnatron filament basket 1953

2,662,998 Witters Electric motor control for 1953
shaft positioning systems

2,663,520 Moseley Glide path control system 1953

2,666,183 Ocnaschek Variable attenuator 1954

2,669,615 Cox Shaft control mechanism 1954

2,669,653 Salisbury Cyclotron tuning apparatus 1954

2,669,696 Ward High powered wave guide load 1954

2,669,698 De Long Radio frequency matching 1954
transformer

2,672,588 Vanous Phasemeter 1954

2,672,608 Ringoen Automatic tracking mechanism 1954

2.674,788 Kohl Method of forming vacuum-tight 1954
metal-to-vitreous seals

2,675,222 Clark Electronic magnetic analytical 1954
balance

2,675,986 Fisher Holddown locking device 1954

2,676,245 Doelz Polar communication system 1954

2,676,289 Wulfsberg Shaft positioning mechanism for 1954
binary code operation

2,678,963 Everhart Through-clamp for coaxial 1954
cables

2,678,966 Pappenfus Synchronizing mechanism 1954

2,679,006 Doelz Frequency selector 1954

2,682,035 Schwittek Linear frequency shift keying 1954
circuit

2,684,538 Noe Break gauge setting device 1954

2,685,032 Cox Automatic frequency control 1954
system

2,685,045 Black Filament tensioning device 1954

2,685,071 McCreary Expansible conductive seal for 1954
resonant cavities

2,688,107 Salisbury Electron beam device 1954

2,689,760 Vanous (self) Detachable handle 1954
for a beverage can

2,690,682 Passman Antibacklash control shaft 1954

2.690,803 Wallace End wire frequency measuring 1954
and cutting jig

2,691,059 Umina Coaxial cable connector 1954

2,691,081 Weber Shaft control mechanism 1954

2,691,118 Salisbury Extremely high-frequency 1954
devices

2,691,132 Sherwood Magnitude and phase meter 1954

2,691,141 Hollis Variable inductor 1954

2,693,325 Lippisch Aerodynamic stabilizing and 1954
controlling means for delta
wing aircraft

2,693,510 Luebking Condenser discharger switch 1954

2,693,544 Kohl Resnatron filament basket 1954

2,693,579 Doelz Longitudinal support of 1954
mechanical filter

2,693,580 Peterson Electromechanical filter with 1954
center drive of disk

2,693,582 Skar Variable coupling device 1954

2,696,953 Lippisch Fluid propelled airplane 1954

2,697,207 Thompson Combined relay and directional 1954
coupler

2,698,387 Schuster Variable inductor capacitor 1954
tuner

2,698,409 Sherwood Differential shaft mechanism 1954
for remote positioning systems

2,698,433 Ringoen Visual display for radiometric 1954
receivers

2,701,327 Ringoen Special relay control of 1955
servomotors

2,702,852 Briggs Automatic frequency control 1955
circuit

2,702,891 Lasho Isolated tube socket 1955

2,704,310 Johnson Homing switch 1955

2,704,324 Broadhead Squelch circuit 1955

2,706,080 Carney Angle shifter 1955

2,709,243 Babcock Drive system for mechanical 1955
filter

2,710,935 Luebking Motor driven shaft positioning 1955
system

2,710,943 Doelz Mechanical squelch system 1955

2,710,959 Pierce Ultra short range altimeter 1955
system

2,710,962 Fritze Punch card controlled aircraft 1955
navigation system

2,712,753 Campbell Frequency measuring apparatus 1955

2,713,084 Berwin Odd mark detector 1955

2,715,802 Wallace Disc sander 1955

2,715,995 Wirkler Automatic tracking apparatus 1955

2,715,998 Stanley Mechanical counter limiting 1955
device

2,716,178 Wallace Assembly jig 1955

2,716,887 Smith Apparatus for measuring the 1955
resonant frequency of a
vibratory element

2,716,896 Beldt Rotation limit device 1955

2,716,897 Wulfsberg Differential mechanism 1955

2,717,345 Hileman Bidirectional remote electrical 1955
control device

2,717,360 Price Double L mixer 1955

2,717,361 Doelz Mechanical filters 1955

2,717,363 Hubbard Resonator tuner 1955

2,717,364 Hodgin Temperature compensation of 1955
permeability tuned circuits

2,717,371 Bruene Tone control system for 1955
controlling a remote station

2,719,084 Countis Special alloy for 1955
magnetostrictive applications

2,719,279 Muckler Sliding coaxial connector 1955

2,723,800 Marner Electromechanical axis 1955
converter

2,724,112 Hepperle Energy absorber 1955

2,724,115 Stewart Tracking system 1955

2,727,296 Craiglow Means for preventing aging 1955
effects in piezoelectric crystals

2,727,372 Haerther Torque limiter 1955

2,728,029 Finger Interdigital magnetron 1955

2,728,235 Mifflin Motion converting mechanism 1955

2,731,604 Hubbard Resonator tuner 1956

2,731,605 Doelz Wind-up coil 1956

2,731,608 Mifflin Inductance corrector 1956

2,731,853 Woolridge Cam pawl shock absorber 1956

2,734,379 Doelz Disc holding and frequency 1956
measuring apparatus

2,734,699 Lippisch Fluid propelled and sustained 1956
aircraft

2,734,942 Heald Magnetic commutator 1956

2,734,950 Jordan Circuit for preventing 1956
intermodulation

2,735,001 Witters Frequency system 1956

2,735,012 Werth Disabling circuit 1956

2,738,425 Heath Flux control means 1956

2,738,471 Cassutt Power amplifier tuning and 1956
loading device

2,741,855 McKinley Gyro stabilized compass 1956

2,742,569 Hodgin Oscillator circuit 1956

2,742,599 Schweighofer Shaft positioning device 1956

2,742,608 Phillips Tester for directional coupler 1956
directivity

2,742,618 Weber Phasing and magnitude adjusting 1956
circuit

2,743,888 Lippisch Variable wing 1956

2,746,151 Kennedy Tracking mechanism 1956

2,746,633 Simmons Eyelet forming method and 1956
apparatus

2,746,918 Whittington Apparatus for electrolytically 1956
tuning and end wire fixture

2,747,084 Doelz Variable band width 1956
intermediate frequency system

2,747,166 Hoffarth Interlocked flexible contact 1956
assembly for shaft

2,748,345 Phillips Standing wave device 1956

2,751,785 Fowler Rate of climb meter 1956

2,752,109 Lippisch Fluid sustained and propelled 1956
aircraft

2,752,491 Ringoen Phase insensitive synchronously 1956
tuned filter

2,752,575 Maclary Rejection filter 1956

2,752,589 De Long Automatic signal level versus 1956
time analyzer

2,754,697 Luebking Planetary shaft positioning 1956
system

2,755,352 Birkemeier Double acting switch 1956

2,755,378 Stover Stabilized discriminator 1956

2,755,379 Hancock R.F. pulsed amplifier 1956

2,755,442 Sherwood Frequency discriminator 1956

2,755,458 Rooks Indicating system 1956

2,756,573 Colby Non-ambiguous coupler 1956
an Oldham coupler with a device to prevent it from being
put together 180 degrees out of phase

2,758,361 Kohl Resnatron filament basket 1956

2,760,103 Salisbury Multiple mode excitation 1956
apparatus

2,760,128 Colby Grid terminal pick-up plate 1956

2,760,130 Carney Differential servo control 1956

2,760,138 Colby Shaft positioning system 1956

2,760,168 Doelz Temperature compensation for a 1956
magnetostrictive transducer

2,760,177 Hollis Removable coaxial vacuum 1956
tube connector

2,760,189 McCoy Range stabilizing apparatus 1956

2,760,190 Henrici Phase angle distance measuring 1956
system

2,760,192 Shanklin Suppression of vertically 1956
polarized radiation from an
omni-directional range antenna
system

2,761,062 Wirkler Carrier-sensing anti-noise 1956
receiving system

2,762,562 Biderman Resolving apparatus 1956

2,762,895 Throw Constant temperature device 1956

2,762,959 Welch Automatic gain control for 1956
electric servo systems

2,762,961 Colby Shaft positioning mechanism 1956

2,762,983 Graves Variable inductance device 1956

2,765,764 Beldt Composite indicator mechanism 1956

2,766,331 Birkemeier Audio compressor circuit 1956

2,766,375 Couillard Direct reading decade frequency 1956
tuning system for double conversion
superheterodyne receiver
Basically the tuning system of the 51J receiver family

2,766,383 Hubbard Tuning device 1956

2,766,436 Luebking Terminal stand-off device 1956

2,766,449 Mitchell Distance measuring system 1956

2,771,250 Icenbice Corrector unit for a coil 1956
winding machine

2,771,516 Bucksbaum Means of coupling energy to or 1956
from a coaxial resonator

2,771,545 Doelz Multiple frequency 1956
communication system

2,771,549 Viterisi Signal receiving circuit 1956

2,771,585 De Long Impedance transformer network 1956

2,771,601 Stewart Tracking and synchronizing 1956
mechanism

2,774,932 Patton Synchronous rectifier and 1956
phase detector

2,775,693 Berwin Pulse amplitude selector 1956

2,775,734 Andrade Filament regulator circuit 1956

2,777,992 Anderson Reactance tube circuit 1957

2,777,996 Bruene Impedance matching device 1957

2,777,999 Hathaway Frequency rejection system for 1957
mechanical filter

2,779,869 Gerks Amplitude distribution analyzer 1957

2,782,362 Lewis Peak voltage regulator 1957

2,786,141 Goetz Balanced tuner 1957

2,786,149 Patton Diverter conversion circuit 1957

2,786,179 Arnold Flux detector 1957

2,791,328 Beardsley Mechanical resonant disc 1957
sorting system

2,791,689 Stillwell High input impedance comparator 1957

2,791,738 Pringle Method of rudder control that 1957
gives coordinated turns at all
air speeds

2,791,744 Carney Wide band phase shifter 1957

2,791,768 Bucksbaum Remote control apparatus 1957

2,791,842 Kennedy Cone of silence simulator 1957

2,793,314 White Long life gas-filled tubes 1957

2,796,585 Freund Single sideband scheme 1957

2,796,587 Phillips U.H.F. Impedance matching means 1957

2,799,461 Anderson Automatic air speed control 1957

2,800,292 Moseley Automatic landing system 1957

2,800,583 Gerks Means of determining cross- 1957
correlation coefficients, such
as between diversity signals

2,800,596 Bolie Distributing delay line using 1957
non-linear parameters

2,800,618 Giacoletto Seeking switch system 1957

2,800,723 Wollan Stabilized magnetic compass 1957

2,802,350 Ottaway Universal joint coupler 1957

2,802,908 Jordan Automatic tuning means 1957

2,802,939 Klehfoth Squelch system 1957

2,802,965 Marner Linear accelerator 1957

2,802,979 Stover Remote control system 1957

2,802,982 Patton Bi-polarity relay amplifier 1957

2,802,992 Doelz Elimination of spurious 1957
response in an electromechanical
filter

2,808,550 Carney Servosystem including phase 1957
sensitive amplifier

2,808,557 Smith Remote control servosystem 1957

2,808,564 Brandt Phase detector fault indicator 1957

2,808,572 Ibsen Center coupled filter 1957

2,810,314 Strong Gear loading device 1957

2,810,512 Lippisch Axial blower with flow control 1957
stator

2,810,793 Bruene Grounded grid power amplifier 1957

2,810,832 Broadhead Stabilized variable oscillator 1957
system

2,810,833 Hubbard Tuner 1957

2,810,834 Stover Temperature compensated 1957
resonant circuit

2,810,875 Mayer Self-braking shaft positioning 1957
means

2,813,431 Griswold Interlocked detent for shaft 1957
positioning apparatus

2,813,679 Heston Positive-negative counting 1957
device

2,814,013 Schweighofer Bidirectional servomotor shaft 1957
positioning means

2,817,193 Unzicker Sanding jig 1957

2,817,719 Decker U.H.F. low noise amplifier 1957

2,817,803 Hileman Direct current voltage step-up 1957
device

2,817,818 Patton Capacity vane modulator 1957

2,820,655 Hileman Tenacious fastener 1958

2,820,933 Passman Non-binding variable capacitor 1958

2,820,952 Hancock High power ladder network 1958
attenuator for frequencies from
zero to over one thousand
megacycles

2,824,452 Colby Shaft positioning mechanism 1958

2,824,453 Winter Differential mechanism 1958

2,824,460 Davis Magnetic reversible nut 1958

2,824,473 Smith Pigtail forming tool with 1958
slide ram

2,825,017 Cunningham Limit control circuit 1958

2,825,050 Hausten Safety interlock circuit 1958

2,825,808 Doelz Keyed filter 1958

2,825,878 Coleman Wave guide switch 1958

2,828,631 Nichols Detent lifting device 1958

2,828,635 Johnson Ratio changing shaft coupling 1958

2,828,929 Lippisch Wingless aircraft 1958

2,829,251 Patton Electronically switched 1958
filter circuit

2,829,255 Bolie Digital frequency synthesizer 1958
system

2,829,350 Ibsen Mechanical filter with coupling 1958
wires

2,833,858 Grondin Code converter 1958

2.833,917 Babcock Locking-oscillator phase-pulse 1958
generator

2,833,919 Stephens Jitter alleviating system 1958
for a scope

2,833,980 Hedgcock End-stop circuit for servo 1958
systems

2,833,990 Van Tilbury Controlled oscillator means 1958
using gated-beam tubes

2,835,873 Yeagley Filter 1958

2,835,889 Dyer Single side band communication 1958
system using mechanical filters

2,840,640 Babcock Mechanical filter frequency 1958
discriminator

2,840,698 Bercovitz Photoelectric switching device 1958
for mechanical squelch

2,840,713 Wulfsberg Multiple tone oscillator 1958
system having constant peak
output voltage
The relay which keys the oscillator also turns on a shunt
attenuator element

2,840,714 Wulfsberg Sidestep oscillation means 1958

2,840,774 Nordstrom Electric motor multiturn 1958
shaft positioning means

2,845,808 Stover Error correction device 1958

2,846,572 Elliott Frequency modulation 1958
transceiver with combined
frequency control

2,847,836 Morris Torque limiting clutch 1958

2,848,160 Biderman Trigonometric computing 1958
apparatus

2,848,611 Bousek Phase stabilization of R. F. 1958
amplifiers and oscillator circuits

2,848,616 Tollefson Stepped frequency generating 1958
means

2,848,627 Majerus Range gate lock-on circuit 1958

2.848,677 Stockwell Shaft positioning control 1958
mechanism

2,848,687 Stanphill Circuit for selecting both 1958
upper and lower sidebands

2,848,711 Rhodes Means for providing linear 1958
indications of shaft rotations
greater than ninety degrees

2,852,622 Fedde Signal-to-noise squelch control 1958
circuit

2,852,653 Kooi Ferrite heater and heat sensor 1958

2,852,682 Icenbice Temperature compensating means 1958
for a tuned circuit

2,852,724 Bargen Multiple synchro heading 1958
selector system

2,852,726 Ocnaschek Starting circuit for 1958
motor

2,852,749 Miedke Sideband selecting system 1958

2,852,752 McCreary Coupling means 1958

2,857,762 McCoy Navigation system 1958

2,858,382 Lehman Duplex antenna switch 1958

2,858,407 Hykes Shock-mounted oven device 1958

2,858,413 Gertz Spot welding device for 1958
mechanical filters

2,858,433 Rector Rate limiting circuit 1958

2,858,434 Tollefson Precision step voltage 1958
generator

2,858,440 Giacoletto Tuner 1958

2,858,454 Bruene Grid bias regulator 1958

2,858,534 Shanklin Marker beacon receiving antenna 1958

2,861,475 Bolie Means for digitally varying 1958
rotational velocities

2,862,165 Younkin Modulation-conversion switching 1958
servo control

2,862,204 Henrici Counter measure system 1958

2,866,941 Sherwood Frequency suppression circuit 1958

2,866,954 Johnson Inductance coil shorting system 1958

2,866,968 Shanklin Antenna computing means 1958

2,869,498 Whittington Soldering jig for mechanical 1959
filters

2,870,321 Yasumura Welding device to attach 1959
transducer wires to mechanical
filters

2,870,326 Sterner Device for selecting signal of 1959
greatest energy

2,870,346 Essler Pulse stretching phase detector 1959

2,870,412 Hern Frequency modulation means 1959
including pulse position modulator

2,870,431 Babcock Matrix-controlled phase-pulse 1959
generator

2,875,622 Nichols Mechanical interpolator 1959

2,875,695 Justice Sealed pumping system 1959

2,875,952 Barry Magnetic integrator 1959

2,875,965 Anderson Automatic flight control 1959
system

2,876,353 Willis Thyratron biasing circuit 1959

2,876,423 Lasho Method for positively removing 1959
a resistance element from a
waveguide

2,879,671 Schulte Gyroscopic erection system 1959

2,879,673 Passman Disengageable shaft locking 1959
mechanism

2,879,957 Lippisch Fluid sustained aircraft 1959

2,880,313 Glynn Crystal oscillator isolation 1959
means

2,880,329 Rector Fading electrical circuit 1959

2,880,400 Tollefson Variable inductor 1959

2,886,707 Jacobson Interpolation device 1959

2,886,708 Perkins Frequency generating system 1959

2,886,752 De Long Servosystem adapted for 1959
automatic adjustment of radio
transmitters

2,886,758 Lehman Voice-operated radio tuning 1959
system

2,887,877 Sharma Method of testing 1959
electromechanical filters

2,888,524 Collins Parasitic oscillation 1959
suppressor

2,888,527 Follensbee Quick-acting squelch circuit 1959

2,888,555 Stover Adaptable input circuit for 1959
receiver providing proper tracking
with either of two antennas of
different impedance

2,888,561 Broadhead Oscillator circuit 1959

2,888,624 Stover Wire saving switching system 1959
for load positioning motor control

2,888,633 Carter Voltage regulator with limited 1959
current drain

2,888,646 Ringoen Low noise frequency modulator 1959
and exciter

2,888,650 Doelz Two end wire mechanical filter 1959

2,888,671 Bolie Electrostatic meter 1959

2,893,138 Bolie Optical analogue of a radio 1959
scattering atmosphere

2,893,257 Schulte Magnetic backlash eliminator 1959

2,893,704 Passman Cooling system 1959

2,894,127 Stillwell Pulse decoding means 1959

2,894,133 Bolie Tuning system for frequency 1959
synthesizing means

2,896.446 Lewis Magnetostrictive disc test 1959
oscillator

2,896,476 Williams Differential mechanism 1959

2,897,299 Colby Information storage drum 1959

2,897,439 Bann Magnetostrictive resonant-disc 1959
test jig

2,897,454 Lewis Sweep generator 1959

2,897,464 Miller Linear tuning curve inductor 1959

2,900,846 Lehman Antibacklash differential 1959
mechanism

2,901,067 Nicholson Shaft positioning clutch device 1959

2,901,208 Jones Stabilized load 1959

2,901,604 Nordstrom Discriminator circuit 1959

2,901,614 Sherwood Coarse frequency discriminator 1959

2,901,700 Bolie Low level microwave power meter 1959

2,901,706 Elliott Impulse-governed oscillator 1959

2,901,729 Broadhead Phase-selective control system 1959

2,905,011 Armstrong Minimum shaft positioning means 1959

2,905,021 Kuykendall Multiple shaft positioning 1959
system

2,905,023 Morris In-line reversing mechanism 1959

2,905,091 Lippisch Fluid pump 1959

2,905,812 Doelz High information capacity 1959
phase-pulse multiplex system

2,905,818 Patton Half-wave phase discriminator 1959

2,905,837 Barry Detector sampling means 1959

2,905,888 Carney Amplitude distribution analyzer 1959

2,905,908 Holzschuh Waveguide switch and electrical 1959
control means thereof

2,905,935 Bolie Decade to binary converter 1959

2,909,933 Kalous Dial system with limit and 1959
lock for multiturn shafts

2,909,940 Dawkins Detent mechanism 1959

2,910,556 Kuykendall Positive position switch 1959

2,910,643 Patton Degenerative magnetic amplifier 1959

2,910,655 Ludvigson Automatic antenna coupler 1959

2,910,661 Glynn Variable inductor 1959

2,914,254 Lehman Tube socket 1959

2,914,674 Barry Phase-pulse receiver 1959
synchronization means

2,914,684 Essler Transistor phase detector 1959

2,915,633 Barry Phase-pulse generator 1959

2,918,157 Nichols Adjustable rotary stop 1959
mechanism

2,918,229 Lippisch Ducted aircraft with fore 1959
elevators

2,918,230 Lippisch Fluid sustained and fluid 1959
propelled aircraft

2,918,231 Lippisch Fluid sustained and fluid 1959
propelled aircraft

2,918,232 Lippisch Twin shroud aerodyne 1959

2,918,233 Lippisch Aerodyne with external flow 1959

2,918,575 Porter Burst eliminator circuitry 1959

2,918,615 Goetz Input-coded shaft positioning 1959
control system

2,918,634 Bercovitz Increase of coupling to 1959
mechanical filter end discs to
improve response

2,918,638 Cattoi Rotatable coaxial joint 1959

2,920,595 Gertz End wire holder 1960

2,921,188 Ringoen Single sideband diversity 1960
system

2,921,247 Morrison On-off and proportional control 1960
transistor servosystem

2,921,271 Collins Transmitter stabilizer 1960

2,921,273 Broadhead Automatic antenna coupler 1960

2,921,278 Phillips Arrangement of directional 1960
couplers for increasing 1960
effective directivity

2,925,965 Pierce Guided missile ordnance system 1960

2,926,244 Stryker Single-tuned regenerative 1960
frequency divider
The notable frequency divider in which the input is mixed with
a multiple of the output frequency to produce the desired output
frequency

2,926,346 Smith Remote control system 1960

2,929,251 Broadhead Combination fine tuning and 1960
slewing device

2,929,404 Griswold Coupling-actuated duct valve 1960

2,929,554 Williams Counter display 1960

2,929,973 Stryker Automatic calibration frequency 1960
responsive servosystem

2,930,006 Hathaway Mechanical filter with 1960
impedance matching discs

2,934,267 Wirkler Vertical speed computer and 1960
altitude control

2,934,281 King Device for rapidly unwinding 1960
excess wire storage
In a toroid winding machine

2,934,645 Dyke Automatically tuned microwave 1960
system

2,934,688 Haerther Fader and switching unit 1960
motor control system

2,934,711 Dawson R.F. amplifier 1960

2,934,716 Smith Variable frequency synthesizer 1960

2,934,721 De Long Unbalanced to balanced network 1960
means

2,938,606 Passman Low friction pawl 1960

2,938,613 Williams Resetting slip clutch, torque 1960
operated

2,938,670 Bolie Means for measuring correlation 1960

2,939,132 Tollefson Cooperative doppler frequency 1960
measuring system

2,939,135 Beckerich Aircraft proximity warning 1960
system with incorporated
testing system

2,939,136 Icenbice Omni-directional receiving 1960
system with directional antenna

2,939,137 Sather Nonlinear glide-slope transfer 1960
network and aircraft control
system

2,939,138 Rennels Bearing correction means for a 1960
direction finding antenna

2,941,156 Coble Frequency detecting system with 1960
gated output

2,941,167 Elliott Stabilized electronic tuning 1960
means

2,941,193 Patton Autopilot monitor system 1960

2,943,482 Firtze Flight director aircraft 1960
instrument

2,947,861 Ulstad Diversity combiner control 1960
system

2,947,862 Stimson High frequency converter 1960
having a series cathode signal
injection circuit

2,947,883 Welch Square wave generator and 1960
diode modulator

2,947,934 Bolie Logarithmic function generator 1960

2,947,951 Hern Stabilizied frequency modulator 1960

2,947,986 Marner Radiometric sextant 1960
stabilization system

2,949,533 Read Automatic gain control circuit 1960
for use in transistor amplifiers

2,949,586 Holzschuh Microwave antenna switch 1960

2,954,707 Kalous Bidirectional, spring-loaded, 1960
control device

2,955,201 Miller Sequential electronic switch 1960

2,955,271 Dawkins Multiturn cable connections 1960

2,956,215 Andrea Retaining clip 1960

2,957,357 Stockwell Adjustable linear cam drive 1960

2,957,634 King Mechanical movement for coil 1960
winding machine
toroid winder

2,958,017 Hogue Fast attack slow release relay 1960
circuit

2,958,028 Smith Remote control system 1960

2,958,051 Perkins Low distortion balanced 1960
modulator

2,961,532 Rowley Negative and positive noise 1960
limiter

2,961,533 Martin Synchronizing frequency 1960
control system

2,961,605 Broadhead Combination loading detector 1960
and standing wave indicator
circuit

2,964,816 Jensen Holding means 1960

2,964,955 Browning Slug tuning device 1960

2,965,400 Lehman Coupling mechanism 1960

2,965,727 Passman Tape indicator and control 1960
switch

2,965,834 Patton Transistor-controlled magnetic 1960
amplifier

2,965,846 Jaycox Percentage pulsing circuit 1960

2,965,857 Bettin Regulator for carrier signal 1960
insertion circuit

2,965,861 Sharma Thickness-shear-mode mechanical 1960
filter

2,965,873 Sindelar Ceramic disc tube socket 1960

2,968,968 Mullen Ball ejection controlled detent 1961

2,969,430 Barry Delay line phase-pulse 1961
generator

2,969,459 Hern Method and means for reducing 1961
the threshold of angular-
modulation receivers

2,969,460 Rowley Adjustable high-frequency 1961
tuning unit

2,969,468 Hogue Frequency and phase 1961
discriminator

2,969,486 Amfahr Voice-operated control system 1961

2,969,540 Stewart Electromechanical phase 1961
detector for radio sextants

2,973,407 Grondin Binary code synchronizer 1961

2,973,420 Craiglow Oven 1961

2,973,476 Graham Test circuit for distributed 1961
capacity of inductances

2,973,481 Frye Electronic limit detector 1961

2,973,488 De Long Impedance matching device 1961
having a folded tapered line

2,973,507 Grondin Call recognition system 1961

2,973,509 Majerus Pulse coding system 1961

2,977,417 Doelz Minimum-shift data 1961
communication system

2,977,538 Secretan Phase measuring system 1961

2,977,585 Cunningham Iso-echo circuit 1961

2,977,596 Justice Inflatable antenna 1961

2,977,597 Du Hamel Frequency independent split 1961
beam antenna
Log-periodic antenna having a bi-lobal pattern with a null,
useful for direction finding

2,980,328 Jacobson Counter mechanism 1961

2,980,827 Hill Voice-operated relay system 1961

2,980,858 Grondin Digital synchronization circuit 1961
operating by inserting extra
pulses into or delaying pulses
from clock pulse train

2,980,862 Bruene Linear low-input R.F. impedance 1961
amplifier

2,980,895 Luik Gyroscope monitoring alarm 1961
system

2,980,898 Mason Fault location system 1961
For a microwave relay system

2,982,929 Stover Variable inductor 1961
rolling an insulated metal tape from one roller to another

2,984,061 Stuhler Double acting spring motor 1961

2,984,065 Stuhler Double acting spring motor 1961

2,984,077 Gaskill Method of using the Peltier 1961
effect for cooling equipment

2,984,701 Barry Phase lock synchronizer for 1961
controlled-shift data
communication system

2,984,729 Hykes Multivibrator type oven control 1961

2,984,777 Bargen Means of interconnecting a 1961
resolver with a standard synchro

2,984,785 Biderman Even harmonic phase detector 1961

2,984,787 Stolze Pulse energy meter 1961

2,984,794 Carter Stable F.M. oscillator 1961

2,984,799 Gerks Broadband-phase R.-C. network 1961

2,984,835 Du Hamel Broadside antenna arrays 1961
based on log-periodic principle

2,988,821 Bolie Simulated perspective display 1961
of aircraft landing strip on
cathode ray tube

2,989,125 Hoppenworth Differential system with 1961
variable diameter sheaves

2,989,649 Welch Low frequency oscillator 1961

2,989,749 Du Hamel Unidirectional frequency- 1961
independent coplaner antenna
based on log-periodic principle

2,994,416 Lasho Mounting structure 1961

2,994,790 Delaney Data phase-coding system 1961
using parallel pulse injection
in binary divider chain

2,994,823 Cunningham Pulse forming circuit 1961

2,994,867 Pierce Collision avoidance 1961
presentation system

2,996,678 Cunningham Iso-echo circuitry for 1961
weather radar

2,996,708 Tollefson Stabilized frequency offset 1961
doppler system

2,998,517 Beckerich Variable bandwidth and center 1961
frequency receiving system

3,000,121 Martin Automatic vertical control of 1961
earth moving machines

3,001,069 Hubbard Straight-line-frequency tuner 1961

3,001,118 Goetz Seeking switch system 1961

3,001,119 Teddlie Connection-board-selector 1961
shaft positioning servosystem

3,001,161 Broadhead Variable inductor having a 1961
variable tap

3,005,095 Stover Signal presence monitor for 1961
noise-type signals

3,005,115 Adamsheck Turret assembly 1961

3,009,271 Kuehne Automatic control of earth- 1961
moving machines

3,009,380 Anderson Fastener with spring arms and 1961
retracting means

3,010,077 Broadhead Oscillator with amplitude 1961
stabilization and starting
phase correction

3,012,447 Wallace Two-revolution mechanical 1961
stop

3,012,449 Stockwell Antibacklash differential 1961
mechanism

3,012,728 Marner Satellite apparent position 1961
computer

3,013,148 De Long Automatic transmitter gain 1961
control circuit

3,013,186 Jones Resilient lightweight 1961
chassis and heat exchanger

3,013,211 Garabedian Counter type phase-pulse 1961
detector

3,013,226 Du Hamel Wideband tapered balun 1961

3,013,262 Tollefson FM doppler navigation system 1961
utilizing first FM sideband

3,013,268 Du Hamel Elliptical-polarized 1961
logarithmically periodic antenna

3,019,532 Haerther Aircraft approach horizon 1962
instrument

3,019,667 Bann Knob 1962

3,020,397 Pierce Intensity comparing system for 1962
determining fraction of travel
time to a radiating source

3,020,421 Craiglow Crystal switching system 1962

3,020,459 Feigleson Analog-voltage shaft 1962
positioning system

3,020,485 Secretan Digital phase-pulse demodulator 1962

3,020,492 Shockley Frequency-controlled magnetic 1962
oscillator

3,020,502 Graham Multicore transformer 1962

3,020,507 Johnson Uniform trolley loading in a 1962
coil

3,020,529 Turner Reflected power alarm for a 1962
variable power output antenna
system

3,024,200 Smith Smoke generator 1962

3,024,391 Ford Load protective circuit 1962

3,024,417 Secretan Proportional digital 1962
synchronizer

3,024,420 Martin Digital phase-pulse detector 1962

3,024,444 Barry Error detection by shift 1962
register parity system

3,028,119 Coble Missile guidance system 1962

3,028,551 Secretan Digital phase storage circuit 1962

3,030,621 McCoy Time enabled beam sensing 1962
and logic circuitry for horizontal
aircraft guidance

3,031,866 Johnson Coupling mechanism 1962

3,032,715 Frye Means for measuring rate of 1962
change of frequency

3,032,751 Hart Data transmission system for 1962
telemetering

3,032,757 Majerus Side lobe suppression network 1962

3,035,806 Hamer Radio hold-down device 1962

3,035,990 Davis Chemical blanking of aluminum 1962
sheet metal

3,036,211 Broadhead Noise controlled variable 1962
A.V.C. delay circuit

3,036,262 Welch Magnetic voltage reference 1962

3,036,302 Hudock Sheet type balanced doublet 1962
antenna structure

3,038,089 Kittrell Duo-transistor amplitude and 1962
frequency sensitive electronic
switch

3,038,114 Patton Automatic pilot control 1962
equipment

3,040,260 Nichols Coded pulse train spacing 1962
tolerance checker

3,041,606 Berry Decoupled horizontally and 1962
vertically polarized antenna

3,041,607 Rhodes Aircraft guidance system 1962

3,049,016 Stuhler Linkage mechanism for a 1962
reciprocating symmetrical
output motion

3,049,667 Broadhead Filter circuit 1962

3,049,673 Barry Disk reference phase-pulse 1962
detector

3,050,642 Rogers Combined squelch circuit and 1962
amplifier

3,056,076 Hedgcock Amplitude modulated A.-C. 1962
error signal servosystem with
error conversion to pulses and
reconversion

3,056,079 Hoglund Variable gain magnetic 1962
amplifier

3,056,087 Broadhead Noise blanking circuit 1962

3,056,090 Chapmon Amplitude discriminating 1962
separator/amplifier

3,056,109 Loposer Automatic morse code 1962
recognition system

3,056,131 McCreary Inflatable antenna 1962

3,058,242 Ocnaschek Control system for earth 1962
moving machine

3,059,129 Tottingham Pulse forming circuit using 1962
momentarily conducting transistor
base-emitter leakage current to
charge timing capacitor

3,059,234 Du Hamel Logarithmically periodic 1962
antenna array

3,064,165 Kennedy Relay speed-up circuit 1962

3,064,172 Young Relay switching device 1962

3,064,196 Broadhead Noise limiter and squelch 1962
circuit

3,064,197 Ek Automatic noise limiter circuit 1962

3,064,211 Spogen UHF transmission line switch 1962

3,064,216 Rowley Disk type turret tuner 1962

3,067,633 Lehman Shaft positioning means 1962

3,068,463 Goldman Multilevel data communication 1962
system having ratio comparison
of sampled adjacent bits at the
receiver

3,078,726 Johnson Mechanical release 1963

3,079,543 Decker Overload and short circuit 1963
protector for transistor
voltage regulator

3,079,558 Spencer Squelch circuit 1963

3,079,562 Elliott Temperature-stabilized and 1963
distortionless semiconductor
detector

3,079,571 Elliott Filter using variable 1963
capacitance junction diodes

3,079,601 Carter Delay generator 1963

3,079,602 Du Hamel Logarithmically periodic rod 1963
antenna

3,080,185 Walker Quick coupler 1963

3,080,518 Cunningham Constant magnetron current 1963
regulator

3,080,530 Smith Nonreciprocal coaxial line 1963
negative resistance amplifier

3,080,532 Cunningham Voltage variable gain circuit 1963
with gate correction

3,080,538 Johnson Center clamped torsional 1963
resonator having bearing
supported ends

3,080,556 Breithaupt Picture communication system 1963

3,088,673 Hallford Temperature regulated chamber 1963

3,088,099 Beckerich Gated I.F. amplifier beam type 1963

3,090,887 Cunningham Background improvement circuit 1963
for direct view storage tube
radar indicator

3,095,146 McCallum Continuous counter 1963

3,098,902 Meyer Rocker switch assembly 1963

3,099,001 Syptak Voltage comparator threshold 1963
alarm circuit

3,099,007 Kittrell Aircraft guidance control 1963
signal development system

3,099,009 Stryker Automatic direction finder 1963
system

3,101,622 Grondahl Balanced control cam for a 1963
driven vacuum variable capacitor

3,102,164 Roiz Synchronizing pulse control 1963
circuit

3,102,236 Eichenberger Squelch circuit controlled by 1963
demodulated voice signal

3,102,237 Elliott Proportional noise limiter 1963

3,102,238 Bosen Encoder with one frequency 1963
indicating one binary logic state
and another frequency indicating
other state

3,106,646 Carter Variable threshold sensing 1963
circuit

3,106,680 De Long Variable threshold high gain 1963
ALC circuit

3,106,681 Smith R.F. amplifier automatic 1963
frequency tuning

3,106,684 Luik Amplifier with interrupted 1963
positive feedback

3,106,710 Stover Automatic direction finder 1963
receiver

3,106,714 Minerva Log periodic antenna with 1963
accordioned radiators to
increase shunt capacitance

3,109,587 Rooks Method of mechanical addition 1963

3,109,944 Seestrom Positive blanking circuit with 1963
isolation capacitor to prevent
input overload

3,109,971 Welch High efficiency instrument 1963
servo amplifier for
microminiaturization

3,109,992 Elliott Temperature-stabilized and 1963
distortionless diode detector

3,109,993 Blair Compression circuit 1963

3,113,240 Perkins Fast switching bistable 1963
thyratron control circuit

3,113,266 Lehman Circuit for determining 1963
location of a break in a cable
having sequentially operated
pulse generating means spaced
along said cable

3,113,316 Berry Uni-directional circularly 1963
polarized log periodic antenna

3,116,619 Spielbaur Multiple disk shaft coupler 1964

3,116,959 Abodeely Telescopable guide pin 1964

3,117,279 Ludvigson Automatically controlled 1964
tuning and loading system

3,117,315 Engholm Simplified pulse error detector 1964

3,120,655 Beason Motion and direction sensing 1964
device

3,122,929 Petry Direct and vernier tuning knob 1964
arrangement

3,123,418 Haerther Chassis unit insert tightening 1964
extract device

3,123,721 Kaufman Gate with adjustable voltage 1964
reference level

3,123,772 Gerks System for measuring refractive 1964
index of ionosphere

3,123,810 Strauch Synchronized readout system 1964
for data tape

3,123,825 Bolie System for improving F.M. 1964
doppler radar

3,123,827 Arnold Log periodic structure feed 1964
system

3,126,622 Hathaway Wiring techniques for cores 1964

3,127,611 Du Hamel Side loaded logarithmically 1964
periodic antenna

3,130,594 Campbell Shaft positioning device 1964

3,130,964 Johnson Composite low rate spring 1964
and shock absorber

3,131,340 Johnson Proportional pulse servo 1964
system

3,131,363 Landee Instantaneous phase-pulse 1964
modulator

3,131,377 Grondin Small gap data tape 1964
communication system

3,131,386 Spencer Multiple circuit signal level 1964
monitor

3,131,392 Kemper Alternate function for VOR-LOC 1964
aircraft meter circuit

3,131,393 Oppedahl Error compensation in radio 1964
direction finders

3,135,122 Pierce Tuning dial index calibration 1964

3,135,919 Heald Tone frequency control means 1964
for kinematically filtered systems

3,135,933 Johnson "M" derived mechanical filter 1964

3,135,934 Schoenike Variable reactance attenuation 1964
network controlled by control
voltage

3,135,936 Martin Movable slug inductor tuned 1964
tank circuit having capacitor
means compensating mechanical
vibration

3,135,947 Grondin Variable bit-rate converter 1964

3,135,957 Cunningham Meterological satellite radar 1964

3,136,860 Hirvela Compensated time division 1964
FM stereo multiplex system

3,137,816 McLin Transmitter automatic frequency 1964
control network including
modulation cancelling means

3,139,537 Secretan Low frequency square wave to 1964
sine wave shaper

3,139,582 Spierling Adjustable level transmitter 1964
gain control

3,139,584 Frederickson Signal input overload 1964
protection attenuation circuit
for transistor receivers

3,139,606 Hathaway Character recognition circuit 1964
using multiaperture cores

3,139,607 Grondin Synchronous communication 1964
system with nonsynchronous
terminals

3,143,663 Johnson Frequency doubler 1964

3,143,706 Michael Radio receiver input protective 1964
self-actuated variable attenuator

3,143,707 Harman Gated dual identical channel 1964
A.G.C.

3,143,710 Hern Peak-to-R.M.S. noise expander 1964
using inverse parallel connected
diodes

3,143,711 Read Transistor amplifier cutoff 1964
means at high signals levels

3,146,307 Renshaw Receiver for data with one 1964
frequency indicating one binary
logic state and another frequency
indicating other state

3,146,397 Broadhead multiple-pole two-position 1964
dual-wafer ultra-high-frequency
transmit-receive switch control

3,146,400 Perlman Keyed filter employing a 1964
crystal as an integrating element

3,151,500 Kurz Snap switch actuating device 1964
for use in a mechanical memory
drum

3,152,227 Durio Automatic recording tape 1964
splicer

3,152,228 Broadhead Switch for progressively 1964
connecting circuits in parallel

3,152,312 Johnson Temperature compensated 1964
inductor

3,155,157 Anderson Temperature stabilized chamber 1964
utilizing thermoelectric cooling

3,155,447 Haerther Safety clasp electrical 1964
connector

3,155,820 Broadhead Binary divider with radix 1964
conversion feedback switching

3,155,890 Biderman Transistor servomotor drive 1964
circuit

3,155,907 Wulfsberg Frequency synthesis system for 1964
multi-frequency transmitter-receiver

3,155,919 Baxter A.F.C. spectrum lock-in circuit 1964

3,160,019 Luik Compensation for gyro pitch 1964
signal velocity change errors

3,160,815 Ford Coherent frequency difference 1964
detector having direct-current
output independent of modulation

3,160,816 Cunningham Iso-echo interference blanking 1964
with output a logarithmic function
of radio frequency energy input

3,160,832 Beitman Automatic coupling and 1964
impedance matching network

3,160,833 Ludvigson Automatic coupling network for 1964
matching the impedance of an
antenna to a plurality of lines
operating at different frequencies

3,162,834 Schweighofer Flight director aircraft 1964
instrument

3,163,393 Strong Component holder 1964

3,163,815 Meier Adjustable signal range 1964
limiting device utilizing
transformer loading

3,163,826 Kemper Frequency modulation detector 1964
having a linear slope output

3,167,680 Seestrom Dual sweep generator 1965

3,167,697 Anderson Synthetic rate generator 1965

3,167,721 Broadhead Transistorized noise pulse 1965
blanking network including
feedback means

3,167,730 Anderson Plural circuits selectively 1965
gated to common branch by diode
gates in which diodes are either
highly or slightly back-biased

3,167,771 Cunningham Blanking circuit synchronized 1965
with code for balancing detector
interference

3,172,294 Stuhler Shaft coupling arrangement for 1965
mechanical modules

3,173,087 Loposer Radio search and intercept 1965
system including serially connected
frequency determining units with
increasing passbands

3,173,093 Most Dual sideband transmitter 1965

3,173,125 Taylor Error corrector utilizing 1965
character average value

3,176,219 Behr Electric outlet ground circuit 1965
test instrument having a relay
means responsive to a predentermined
current flow

3,176,238 Dickerson Voltage equalizing circuit for 1965
constant gain during switching
of AGC circuit

3,176,243 Meier Full-wave differential control 1965
circuit employing single
saturable core transformer

3,176,244 Newell Temperature compensation of 1965
quartz crystal by network
synthesis means

3,176,265 Schweighofer Flight director display 1965

3,176,289 Breithaupt Electronic display apparatus 1965

3,176,302 Tipton Inflatable variable-bandwidth 1965
antenna

3,180,653 Passman Suspension system for a 1965
transportable hut

3,181,011 Durio Ring-counter utilizing 1965
capacitance-diode network in
coupling and in feedback circuits
for wide frequency range operation

3,181,032 Myers Circuit overload responsive 1965
shutoff system with relay
driving energy storage

3,181,073 Brower Tunable phase detector 1965

3,181,161 Minerva Horizontally polarized log 1965
periodic antenna over ground

3,182,261 Broadhead SSB-FM detector 1965

3,187,713 Fenwick Linear dial for radio 1965
transmitter or receiver with
moving pointer and scale

3,188,495 Grimm A.C. detector circuit 1965

3,188,546 Dawkins Motor reversing control with 1965
counterweight to reduce
reaction torques

3,188,566 Bullene Intermodulation measurement 1965
system including resonant
filter trap means

3,188,570 Myers Time delay antenna disconnect 1965
during tuning

3,188,571 Michael Detected noise actuated, AGC 1965
noise-quieting action dependent
and total noise level adaptive
RF receiver squelch system

3,188,590 Earley Roller contact concept 1965

3,188,644 Sielaff Weighted defvice for damping 1965
out vibration in an antenna
element

3,190,582 Lippisch Ground effects utilizing and 1965
transition aircraft

3,193,651 Hawthorn Cam actuated switch 1965

3,193,709 Baxter Voltage monitoring and 1965
controlling device

3,193,711 Western Step-start circuit 1965

3,193,747 Kittrell Servo system with particular 1965
phase detector-modulator
transistor bridge circuits

3,193,756 Godbey Voltage protector and 1965
attenuator for receiver
input circuits

3,193,760 Smith Air pressure sensitive bridge 1965

3,193,777 Carter Transistor amplifier-oscillator 1965
with a feed back switching circuit

3,193,801 Grondin Large gap data communication 1965
system

3,199,028 McLin Dual feedback direct frequency 1965
modulation scheme

3,199,077 Prather Code and complement testing 1965
device

3,204,045 Tuthill Automatic ring thru system 1965

3,204,124 Durio Means for producing clock 1965
pulses whose widths vary as
their repetition rate

3,204,125 Beckerich Phase synchronized signal 1965
amplifier

3,204,127 Meier Digit memory circuit 1965

3,204,175 Kuriger Automatic self-starting 1965
voltage regulating device

3,204,190 Broadhead Frequency discriminator circuit 1965

3,205,456 Swanson Low frequency audio distortion 1965
reduction circuit for transmitters

3,209,602 Biderman Drive and sensing means for 1965
ball gyroscope

3,210,474 De Mong Receiver means for reproducing 1965
monaural or stereo signals

3,210,651 Runyan Square wave phase shifter 1965

3,210,654 Biderman Direct current flux detector 1965

3,210,658 Stevens Shaft rotational velocity and 1965
direction indicating means utilizing
a pulse producing and blocking
commutator

3,210,667 Hern F.M. synchronous detector 1965
system

3,210,678 Hallock Feedback stabilized direct 1965
coupled amplifier

3,210,680 Farris Audio signal variable 1965
attenuating circuit

3,210,749 Magor Flag warning circuit 1965

3,210,753 Meier Analog to digital converter 1965

3,210,764 Anderson Dual band blade antenna with 1965
filtering and matching network
on blade

3,210,765 Jones Antenna element damping device 1965

3,210,768 Hudock Log periodic antenna fed by 1965
single zigzag conductor which
reduces capacitive loading on the
monopole radiators and reduces
cross polarization

3,211,847 Johnson R-F matrix switch line with 1965
integral stub disconnect

3,211,974 Rhodes Servo system with rate feedback 1965

3,211,986 Schultz Square wave frequency doubler 1965

3,212,023 Broadhead Digital stabilized master 1965
oscillator with auxiliary
high frequency loop

3,212,094 Berry Vertically polarized 1965
unidirectional log periodic
antenna over ground

3,215,391 Storm Positioning device continuous 1965
in azimuth and elevation using
multiple linear drives

3,215,954 Stevens Radio frequency matrix switch 1965
with integral automatic stub
disconnect

3,217,255 Broadhead Synchronous communication 1965
system

3,217,275 Duncan Multicoupler system utilizing 1965
tunable trap

3,218,542 Taylor Electronic circuit protection 1965

3,218,644 Berry Frequency independent slot 1965
antenna

3,221,330 Berry Cavity backed log periodical 1965
antenna system

3,223,793 Fackler Constant pressure type contact 1965
spring

3,225,209 Schuster Two-level D.C./A.C. power 1965
converter or amplitude modulator

3,225,262 Myers Dual-transistor holder 1965

3,225,313 Rexroad Pulse triggered VHF crystal 1965
controlled oscillator

3,228,210 Farmer Bi-directional overload clutch 1966

3,229,297 Bell Wide-band dual conical antenna 1966
with intermediate impedance
transition coupling

3,230,352 Grondin Means for dividing a frequency 1966
by any number

3,230,399 Hykes Frequency divider 1966

3,230,458 Stangeland Automatic gain control circuit 1966
with fast change of time constant

3,238,315 Deasy Rotary multiple cam circuit 1966
disconnect and reconnect switch

3,238,459 Landee Unambiguous local phase 1966
reference for data detection

3,239,773 Kaufman Wide-band cascode VHF amplifier 1966
utilizing inherent transistor
reactance

3,241,792 Hattendorf Programmed angle of attack 1966
control system for aircraft

3,243,742 Fletcher Variable radio frequency 1966
resonator without sliding contacts

3,244,998 Broadhead Impedance matched broad band 1966
transistor amplifier

3,245,079 Stover A.D.F. receiver 1966

3,245,546 Stuhler Self-locking handle 1966

3,247,460 Oppedahl D.C. amplifier utilizing 1966
saturable cores

3,249,871 Duncan Constant forward power control 1966
circuit for transmission system

3,251,007 Schmitt Crystal controlled oscillator 1966
having output frequencies other
than crystal frequency harmonics

3,258,711 Searl Transmit gain control circuit 1966

3,258,743 Schuster Para-visual wave motion 1966
indicator

3,258,756 Meier Complementary bridge 1966
differential control circuit

3,259,793 Glynn System for controlling the 1966
over-voltage or "hot shot" time
on instant-heating tubes

3,259,897 Strathman Suppression network for 1966
transponder or similar apparatus

3,260,959 Broadhead Tunable phase shift resonant 1966
circuit stabilized crystal
oscillator

3,262,065 Fredrickson Two polarity automatically 1966
variable audio noise limiter

3,262,117 Stover Digital omnirange system of 1966
higher accuracy than existing
omnirange systems

3,262,121 Holloway Antenna feed point crossover 1966

3,265,871 Willis Satellite true position 1966
computer

3,265,904 Spencer Solid state synchro and 1966
synchronization means

3,265,976 Broadhead Combined frequency and phase 1966
discriminator

3,265,994 Bruene Radio frequency coupling 1966
transmission line circuitry

3,266,746 Brown Quick release tape spool 1966

3,266,859 Champlin One-piece plastic semi- 1966
articulated self-spring hinge

3,267,625 Holzschuh Latching mechanism for an 1966
extensible antenna

3,268,650 Hepker Vertical component mounting 1966
means

3,268,825 Mathes Anode dissipation limiter 1966

3,270,214 Broadhead High frequency short pulse 1966
trigger generator employing two
voltage variable semiconductive
capacitors

3,273,045 Benson Circuit for synchronizing 1966
firing of diodes in diode-
controlled rectifier

3,273,065 Stover Means for measuring signal 1966
intensity without interrupting
the received signal

3,273,159 Holloway Log periodic antenna comprised 1966
of parallel fed quad elements

3,274,493 Renshaw Circuit for removing distortion 1966
in a time synchronous phase
modulation receiver

3,276,012 Secretan Analog-to-digital converter 1966

3,276,255 Hattendorf System for development of 1966
complemented vertical speed
in aircraft

3,277,390 McLin Modified heterodyne phase-lock 1966
frequency multiplier

3,282,316 Griswold Hold-down for aviation 1966
equipment with friction non-
turn device

3,283,079 Dixon Phase control network for a 1966
stereophonic system

3,283,213 Kosanda Printed circuit card latch 1966

3,283,313 Hathaway Thin film magnetic register 1966

3,285,529 Campbell Tape tensioning device 1966

3,286,183 Bergemann Single sideband carrier 1966
receiver system which produces
an accurately phased carrier
injection signal

3,287,670 Schroeder High power ferrite stacked disc 1966
core HF transformers and/or
power dividers

3,291,951 Kalous Miniature single-pole double- 1966
throw switch

3,292,171 Wilson Display device depositing 1966
suspended particles by selective
magnetization of a viewable
surface 1966

3,294,907 Heald Synchronizing signal deriving 1966
means

3,294,984 Wisecarver Ring counter starting circuit 1966
employing OR gate for preselecting
starting stage and then isolating
starting circuit

3,295,037 Bullene Electronic Bi-directional D.C. 1966
motor braking

3,295,051 Broadhead Multiple crystal frequency 1966
selective multiplier

3,295,137 Fenwick Shortened folded monopole with 1966
radiation efficiency increased
by ferrite loading

3,295,592 Nissen Temperature cycling device for 1967
precision frequency crystals

3,296,618 Tuthill Clock timed reference gated 1967
pulse generating system for a
TACAN beacon

3,297,882 Broadhead Limiter-compressor circuit 1967

3,297,961 Frerking Means for tuning crystal 1967
oscillator

3,297,964 Hamilton Error avoidance system for 1967
sampling type AFC circuit

3,297,965 Chadima Frequency control system having 1967
phase controlled sampling means

3,297,966 Bruene Modulator for grounded screen 1967
tetrode R.F. power amplifier

3,298,027 Stover Digital automatic direction 1967
finding system

3,299,296 Bullene Low level threshold detector 1967
with temperature compensation

3,300,740 Herzog A.C. ripple and noise reduction 1967
without increasing current drain

3,300,764 Doelz Data processor 1967
C-8401

3,302,117 Smith Gain control circuit with 1967
selectable attack time constant
that is independent of a fixed
decay time constant

3,302,472 Williams Intermittent rotary mechanism 1967

3,302,476 Williams Detented drive mechanism 1967

3,302,697 Jacko Device for improving heat 1967
transfer air flow

3,303,354 Carroll Temperature stable low 1967
frequency filter without
inductance

3,304,487 McCaskey Regulated adjustable power 1967
supply having a primary current
controlled by input and output
voltages

3,304,511 Ulstad Gain stabilization network for 1967
negative resistance amplifier

3,305,776 Duncan Parallel resonance 1967
discriminator including an
inductively coupled tuned circuit

3,310,745 Deasy Fast AGC voltage decay circuit 1967
for data signal handling 
sideband receivers

3,312,972 Alitz TACAN azimuth calibration 1967
technique

3,313,495 McWilliams Hub expanding device 1967

3,313,496 Northrup Reel hub 1967

3,315,768 Stuhler Hydraulic shaft positioning 1967
mechanism

3,319,178 Broadhead Plural loop automatic phase 1967
control

3,319,748 Joyce Capstan drive 1967

3,320,535 Broadhead Transmitted signal two tone 1967
difference controlled single
sideband squelch and AVC system

3,321,218 Johnson Branch duct configuration of 1967
a fluid system

3,321,630 Durig System for the detection of 1967
high intensity light flashes

3,323,036 Runyan Alternator regulator 1967

3,324,974 Champlin Printed circuit card damper 1967

3,325,644 Frye Switching type radiometer 1967
having variable duty cycle

3,326,067 Nelson Apparatus for tuning 1967
mechanically resonant elements

3,327,219 Cunningham Detector circuits for directly 1967
strobing radio frequency signals

3,328,527 Miles Single conductor audio 1967
frequency signal and D.C.
switching transmission system

3,328,694 Brady Bilateral transmit-receive 1967
function dual quad diode bridge
oscillator frequency translator
circuit

3,328,762 Prather Signal separating and delay 1967
circuit

3,329,829 Grimm Pulse magnitude regulating 1967
system

3,329,921 Badelt Adjustable center tap resistor 1967

3,332,017 Dennis Combined ALC and power level 1967
transmitter control

3,333,117 Carter Use of resistive feedback in 1967
unbalanced R-C integrator

3,333,795 Hattendorf Flare computer 1967

3,336,593 Stover Asychronous time sharing system 1967
for multiple FM altimeter

3,337,814 Brase Phase comparator for use in 1967
frequency synthesizer phase
locked loop

3,337,850 Loumeau Digital phase transition 1967
detector

3,341,776 Doelz Error sensitive binary 1967
transmission system wherein
four channels are transmitted
via one carrier wave

3,341,781 Rooks Method of reducing AVC TC 1967
in AM modulated radios

3,341,833 Jones Magnetic tape recording and 1967
reproduction system

3,342,041 Nebiker High stress insulated coupling 1967

3,343,066 Cribbs Voltage and current controlled 1967
rectifier

3,345,579 Wilkinson Phase locked crystal controlled 1967
oscillator

3,345,635 Fenwick Folded vertical monopole 1967
antenna

3,346,728 Broadhead Binary divider with multiple 1967
feedback lines

3,346,740 Brobst High frequency parametric 1967
amplifier of the up-converter type

3,347,490 Browning Level wind for airborne 1967
trailing wire antenna parallel
to the drum axis

3,350,650 Kemper Noise and audio controlled 1967
squelch circuit

3,350,697 Hirvela Storage means for receiving, 1967
assembling, and distributing
teletype characters

3,351,861 Martin Dual time constant AVC circuit 1967

3,351,875 Midgley Ring coupled mechanical filter 1967

3,354,398 Broadhead Digital frequency comparator 1967

3,354,403 Thomas Counter step-down frequency 1967
synthesizer

3,355,126 Oppedahl Radio beam capture circuit 1967
for aircraft guidance

3,355,548 Hodge Data transmitting system with 1967
data represented by combinations
of different pulse and D.C.signals

3,355,667 Bruene Automatically tuned coupled 1967
resonant circuits

3,355,739 Bell Shunt excited log periodic 1967
antenna with coax feed

3,356,918 Williams Tape controlled positioning 1967
and tuning system

3,356,926 Mason Voltage doubler rectifier with 1967
constant voltge and variable
output voltage

3,358,234 Stover SSB system which overcomes 1967
problems of squelch, impulse
interference, and AGC as commonly
encountered

3,360,795 Lundgreen Digital time domain mode 1967
ranging system

3,363,159 Bollhoefer Electromagnetic stepping device 1968

3,363,190 Anderson Sensitive long time constant 1968
bistable amplifier

3,363,254 Carrel Broadband antenna with 1968
direction of radiation determined
by frequency

3,364,492 Griffee Single element homing antenna 1968

3,365,546 Kemper Microphone bias supply for 1968
reducing or eliminating key clicks

3,365,853 Holzschuh Transportable antenna tower 1968

3,366,898 Brown Spiral resonator 1968

3,366,918 Johnson Shell-to-shell-to-shelf RFI 1968
seal spring

3,368,036 Carter Demultiplexing and detecting 1968
system for predicted wave
phase-pulsed data transmission
system

3,369,185 Carter RC correlator circuit for 1968
synchronous signal detection

3,369,190 Pope Phase locked indicator for 1968
plurality of oscillators phase
locked to common reference

3,370,255 Brower FM system using crystal 1968
oscillator

3,370,289 Hedgcock Digital-to-analog converter 1968
system

3,374,483 Fenwick Tunable electrically small 1968
antenna

3,374,977 Moy Antenna positioner 1968

3,376,514 Womack Encoded synchronous demodulator 1968
circuit

3,376,573 Read Crab angle sensing system for 1968
all-weather landing system

3,376,755 Joyce Mechanical movement 1968

3,377,560 Renshaw Direct data sample single tone 1968
receiver

3,378,742 Telkamp Seeking switch motor control 1968
system

3,378,786 Andrea Digitalized signal gain control 1968
circuit

3,379,992 Hoo Multiple frequency signal 1968
generator

3,380,654 Williams Drive mechanism for a 1968
mechanical counter

3,381,203 Mitchell A-C to D-C converter 1968

3,381,570 Anway Full rotation measuring 1968
optical instrument providing
precise angular readout

3,382,351 Schweighofer Rollout guidance display 1968

3,384,790 Holec Timing circuit employing SCR 1968
diode

3,384,873 Sharma Selective calling system 1968

3,386,030 Kann Voltage regulator 1968

3,386,042 Moes Diode detector having 1968
individual audio and rectified
D-C doubled outputs

3,386,096 Lundgreen Digital instrumentation for 1968
omnirange

3,389,678 Fenwick Display for radio altimeter 1968

3,390,343 Carter Single side-band pulse 1968
product detector

3,390,349 Hallford Method and means for tuning 1968
klystron for optimum modulation
linearity

3,390,392 Mayer ADF system employing angle 1968
modulation

3,392,291 Andrea High speed frequency divider 1968

3,397,585 McGowan Quick return drive linkage 1968

3,398,267 Hattendorf Aircraft vertical path computer 1968

3,399,311 Andrea Frequency divider employing 1968
inductive switching

3,400,397 Stover Aircraft position 1968
identification system

3,400,402 Gallagher Wire antenna extensible along 1968
calibrated support means

3,402,389 Koontz Message verification using 1968
associative memory techniques

3,403,350 Womack Magnetic domain impressed 1968
coated wire attenuator with 
wide dynamic range

3,403,398 Engholm Double bounce second signal 1968
return filter corrected
FMCW radio altimeter

3,405,364 Hart Reflex quenched 1968
superregenerative detector

3,408,552 Weber Automatic protection circuit 1968
for remediable short circuit
in load

3,413,562 Hartin Clipper amplifier circuit 1968

3,413,570 Bruene High efficiency RF power 1968
amplification with modulation
signal controlled "ON"-"OFF"
switch varied amplifier 
DC potentials

3,413,571 Ulrick Keyer/modulator circuit for 1968
encoding generalized periodic
waveforms into phase script

3,413,574 Schroeder Broadband high efficiency 1968
impedance step-up 180[degree]
phase shift hybrid circuits

3,414,842 Broadhead Frequency modulated reference 1968
controlled oscillator

3,417,336 Cribbs Rectifier frequency shift 1968
keyer (FSK) converter and
filter circuit

3,417,403 Fenwick Electrically small spiral 1968
antenna tunable over a wide band

3,419,787 Baehre Semiconductor circuit for 1968
A-C to D-C conversion or
frequency multiplication

3,419,874 Moorehead Mechanical tuning arrangement 1968
for dual helix winding antenna
(compact antenna, 30-76 megacycles)

3,420,990 Andrea Hybrid counter 1969

3,421.095 Hardaway Continuous hemispherical 1969
contour limit switch for antenna

3,422,356 Fritts Feedback compressor circuit to 1969
control maximum percentage
modulation

3,426,140 Templeton Connector RFI seal spring 1969

3,426,266 Day Signal modulated self-regulated 1969
switching voltage regulator-amplifier

3,426,352 Fenwick Capacitively tuned reflector 1969
antenna

3,427,520 Oppedahl DC servo amplifier for armature 1969
drive motor

3,429,999 Stover Circuit for preventing singing 1969
in audio systems

3,430,147 Hennessey Squelch tail preventing circuit 1969

3,431,509 Andrea Phase locked loop with 1969
digitalized frequency and
phase discriminator

3,432,816 Hutchinson Glass delay line recirculating 1969
memory

3,435,253 Robinson Symmetrical clipper 1969

3,435,347 Decker Cam mounted series resontant 1969
trap for tunable RF power
amplifier to antenna coupling
circuit

3,436,327 Shockley Selective sputtering rate 1969
circuit forming process

3,436,655 Lundgreen Rotation measuring device for 1969
very slowly rotating shaft

3,437,932 Malakoff FSK receiver wherein one 1969
binary signal is represented by
a half cycle of a given frequency
and the other binary signal is
represented by a full cycle of
twice that frequency

3,439,295 Bise Mechanical filter with 1969
attenuation poles on both sides
of passband

3,440,574 Johnson Mechanical filter having 1969
general stopband characteristics

3,440,645 Feigleson Analog-to-digital converter 1969

3,441,862 Mitchell Bi-phase demodulating circuit 1969
independent of reference signal
amplitude distortion

3,441,868 Anderson Amplifier with hum eliminating 1969
circuit

3,443,239 Schmitt AM amplifier circuit 1969

3,448,297 Rhodes Analog multiplier 1969

3,448,391 Hutchinson Keyed filter using RC circuits 1969

3,448,396 Conant Electronic circuit-direct 1969
coupled totem pole emitter follower

3,449,751 Schroeder Complementary pair antenna 1969
element groups

3,452,293 De Long Dual-band transmission line 1969
tunable resonant tank circuit

3,453,517 Kennedy Control system for direct 1969
current motor

3,453,565 Carli Adjustable harmonic trap whose 1969
tuning tracks the tuning of 
pass band means

3,454,881 Fletcher Automatic tuning control for 1969
R.F. power amplifiers

3,454,960 Lohrenz Tape transport servomechanism 1969
utilizing digital techniques

3,456,186 Bush Circuit for measuring sheet 1969
resistivity including an A.C.
current source and average
reading D.C. voltmeter switchably
connected to pairs of a four
probe array

3,456,205 Schmitt Circuit for preventing 1969
overdriving of transistors

3,461,421 Stover Advanced direction finding 1969
sonobuoy system

3,463,938 McCoy Low distortion wide dynamic 1969
range phase detector

3,464,019 Wilkinson Reference signal phase shift 1969
transition detector

3,465,101 Christian High speed inter-computer 1969
communication using narrow
bandwidth twisted pair cable

3,465,127 Anderson Frequency controlled oven 1969

3,465,217 Kress Digitalized shaft rotation 1969
direction control

3,465,222 Bishop Automatic direction control 1969
for an electrical motor

3,465,262 Kemper Chime generator circuit for a 1969
P.A. amplifier

3,465,339 Marner Method and means for detecting 1969
air turbulence

3,466,230 Carithers Tantalum thin film capacitor 1969
production leakage current
minimizing process

3,466,254 Deasy Three position RF circuit 1969
rotary switch

3,466,430 Hardaway Extreme parameter search 1969
control system

3,466,539 Pitts Four-point probe for 1969
microminiatruized circuitry
having individual biasing means
for each point

3,467,005 Bernard Printer hammer drive circuit 1969

3,475,656 Hepker Radio chassis assembly 1969

3,475,703 Kennedy Coarse step-fine tune 1969
automatically tunable antenna

3,478,355 Lundgreen Echo false distance indication 1969
prevention circuit for aircraft
DME and TACAN

3,480,888 Elliott Electronically tuned filter 1969

3,482,165 Leming Switchover system to provide 1969
antenna protection and space
diversity configuration

3,483,548 Majerus Synchro actuated switch system 1969

3,483,563 Schroeder Combination vertically- 1969
horizontally polarized
paracylinder antennas

3,485,107 Holubar Tape drive 1969

3,488,598 Hoo Closed loop control system 1970
employing A-C amplification of
D-C error correcting signals

3,488,608 Johnson General stopband mechanical 1970
disc filter section employing
multi-mode discs

3,496,314 Williams Switch mechanism 1970

3,497,794 Frederickson Internal reference voltage 1970
source equipped switching
regulator

3,499,171 Carrel Insulated reel mechanism for 1970
high-power aircraft trailing
antenna

3,499,641 Peterson Fluid pressure actuated 1970
diaphragm workpiece clamping
device

3,499,782 Shockley Substrate protective oxidized 1970
coating process

3,500,214 Broadhead Reference signal and digital 1970
switch-varied signal generator

3,500,250 Frerking Carrier suppression system for 1970
spectrum analysis

3,506,786 Sloate Means for synchronizing frame 1970
and bit rates of a received
signal with a receiver

3,506,815 Stone Binary converter 1970

3,506,930 Gantick Broadband multichannel phase 1970
modulation system employing
digitally controlled signal
reflection means

3,508,519 Campbell Pushbutton flag 1970

3,509,279 Martin AM data detector with reference 1970
level responsive to input and
detected data to produce
comparison signal

3,510,581 Craiglow Optimum postdetection filter 1970
for microwave radiometric 
mapping system

3,510,682 Nichols Digital controlled variable 1970
gain circuit

3,513,378 Kemper Low source impedance voltage 1970
regulator

3,514,705 Feigleson Digital subtractor circuit 1970

3,514,719 Rhodes Electric analog angular 1970
rate deriving circuit

3,514,764 Williams Memory switching device 1970

3,516,029 Johnson Mechanical filters employing 1970
multi-mode resonators

3,516,069 Bray Data character assembler and 1970
disassembler

3,517,297 Durio Multi-output DC power supply 1970
means

3,518,695 Schroeder Antenna array multifrequency 1970
and beam steering control
multiplex feed

3,519,762 Morris Tape duplicator with master 1970
and copy tapes driven by same
spindle and capstan means

3,522,448 Hallock R-F phase detector 1970

3,522,610 Schroeder Antenna array aperture 1970
multiplexing transmission feed
and receive systems

3,524,541 Nelson Package for small and delicate 1970
devices

3,525,038 Felt Circuit discontinuity detector 1970
including tunnel diode and
silicon controlled rectifier means

3,525,995 Schroeder Amplitude tapering, 1970
nonsymmetrical binary feed networks
for high-power RF phased arrays

3,527,112 Korell Long wearing friction drive 1970
mechanism

3,528,039 Parker Circuit for adding constant DC 1970
bias, supplied by a reference
Zener diode, to a variable
input signal

3,529,283 Emerson Aircraft flight director 1970
instrument

3,531,695 Bush Electrochemically variable 1970
capacitor

3,531,776 Sloate Means for synchronizing equal 1970
but unsynchronized frame rates
of received signal and receiver

3,533,006 Kubicz Infinite range electronics 1970
gain control circuit

3,534,222 Epler Electronic timer circuit for 1970
delayed application of discharge
potential

3,534,270 Rutherford Time mark generator 1970

3,534,322 Hoffa High voltage, high altitude 1970
coaxial connector

3,535,651 Peterson Phase locked frequency source 1970
with automatic search circuit

3,538,252 Melvin Start pulse receiving circuit 1970

3,538,450 Andrea Phase locked loop with digital 1970
capacitor and varactor tuned
oscillator

3,538,881 Fenwick Horizontal situation indicator 1970
with nonlinear compass card

3,539,787 Williams System for converting four-wire 1970
information into binary coded
decimal information

3,539,825 Hardaway Highly linear voltage to 1970
frequency converter

3,543,188 Livingston Microwave diplexing technique 1970
employing predistorted waveguide
filters

3,544,906 Dulaney Logic pulse time waveform 1970
synthesizer

3,544,976 Collins Digitalized communication 1970
system with computation and
control capabilities employing
transmission line loop for data
transmission

3,546,597 Lipke Frequency divider circuit 1970

3,546,607 Dixon Noice immune muting circuit 1970
for pulse counting detectors

3,548,310 Fenwick Antenna current distribution 1970
measurement system

3,549,912 Lewis JK flip-flop 1970

3,555,393 Williams Remote tuning system for 1971
plurality of controlled units
employing common tuning control
and indicator

3,560,982 Fenwick VLF-LF aircraft trailing 1971
antenna

3,562,558 Totten Delay line control gated 1971
midrologic clock generator

3,562,654 Conant Electronic counter 1971

3,563,391 Weltha Card guide 

3,564,430 Brudevold Linear rectifier with polarity 1971
detector

3,564,936 Korell Thumb-operated interlocked 1971
two axis, joystick actuator

3,566,180 Ewton Means for suppressing helix 1971
current during mechanical
focusing of traveling wave tube

3,567,303 Cox Self-locking handle 1971

3,568,067 Williford Frequency discriminator with 1971
output indicative of difference
between input and local 
reference signals

3,568,085 Pimenoff Frequency short interval 1971
sample and long period
frequency hold circuit

3,569,649 Spielbauer Electrical switch contact 1971
structure with improved
inflatable bladder actuating means

3,569,750 Beaver Monolithic multifrequency 1971
resonator

3,569,836 Deen Method of reducing signal 1971
distortion and improving operating
efficiency by selectively
shifting parasitic resonant
frequencies away from harmonics
of operating frequency

3,569,840 Tanaka Carrier squelch scheme 1971

3,569,873 Beaver Insertion loss equalization 1971
device

3,569,970 Fenwick Portable antenna having a mast 1971
formed of coaxial waveguide
sections

3,569,971 Griffee Dual band cavity backed antenna 1971
for radio navigation

3,571,619 Dickerson Phase detector with improved 1971
dynamic range

3,571,697 Phillips Variable impedance switching 1971
regulator

3,571,728 Andrea Fractional frequency divider 1971

3,571,766 Teske Disk-wire mechanical filter 1971
using bridging wire to achieve
attenuation pole

3,572,108 McShane Means for testing wire bonds 1971
in micro-electronic circuits

3,572,135 Williams Relative position lockout for 1971
step-positioned shaft pair

3,572,149 Cain Drive mechanism 1971

3,573,604 Lundgreen RMS AC voltage regulator 1971

3,573,611 Bergemann Simultaneous delay measurement 1971
between selected signal frequency
channels and reference frequency
channels

3,573,671 Johnson Lattice-type filters employing 1971
mechanical resonators having
a multiplicity of poles and zeros

3,573,734 Williams Solid state touch-tune system 1971

3,576,396 Sloate Means for adapting a 1971
transmitted signal to a receiver
with synchronized frame rates
but unequal bit rates

3,577,006 Tyrrell Fail-safe pulsed logic and gate 1971

3,577,092 Kubicz Signal path series step-biased 1971
multidevice high-efficiency
amplifier

3,577,148 Holzschuh Portable reelable dipole 1971
antenna having frequency
calibrated dial

3,579,154 Deen VHF filter having absorptive 1971
tuned section to eliminate
narrow spurious passband

3,584,237 Stephens Converter circuit 1971

3,585,514 Kubicz Power responsive overload 1971
sensing circuit

3,586,878 Maxham Sample, integrate and hold 1971
circuit

3,587,391 Pitts Work support mechanism 1971

3,588,534 Campbell Peak-slope frequency 1971
discriminator

3,588,732 Tollefson Frequency synthesizer 1971

3,593,829 Williams Mechanical stop limit means 1971
for lead screw-driven ram

3,596,017 Williams Mechanical adjustment means for 1971
electrical limit switches

3,596,107 Kittrell Signal selector 1971

3,597,599 Melvin Digitalized tone generator 1971

3,599,015 Ulrick Sense amplifier/discriminator 1971
circuit

3,600,694 McCollum Power normalization of angular 1971
information from three-wire
synchro source

3,601,701 Salmon Bi-phase keyed modulator- 1971
demodulator system

3,601,791 Emerson Vehicle station keeping 1971
display apparatus

3,603,660 Weltha Box holddown device 1971

3,604,107 Fassett Doped oxide field effect 1971
transistors

3,609,601 Phillips Monolithic filter having "M" 1971
derived characteristics

3,611,158 Strathman Signal pulse trigger-gating 1971
edge jitter rejection circuit

3,611,387 Stover Antenna polarization correcting 1971
means for backpack radios

3,612,243 McAllister Material handling apparatus 1971

3,613,001 Hostetter Probe assembly 1971

3,614,036 Foster Conversion principle-angle 1971
of attack to airspeed

3,614,591 Brown Failsafe and monitor circuit 1971

3,614,619 Huntsinger Digital clock accuracy monitor 1971

3,614,674 Hill Filter apparatus 1971

3,614,686 Ellis Multiposition magnetically 1971
held fail-safe switch

3,616,555 Campbell Compact annunciator package 1971

3,617,656 Elliott Test spectrum recognition 1971
circuit for communication
link analyzer

3,617,721 Foster Mach computation from altitude 1971
and calibrated airspeed

3,617,723 Melvin Digitalized multiplier 1971

3,618,085 Hall Error detector for digital 1971
DME systems

3,618,105 Bruene Orthogonal dipole antennas 1971

3,619,019 Hepker Variable length compensating 1971
lever latch handle mechanism

3,619,655 Cunningham Noise paralleled signal 1971
seriesed multistaged amplifier

3,619,658 Prunty Gate controlled switch 1971
employing transistors

3,620,631 Stopka Gain-controlled amplifier 1971

3,621,210 Canning Combined performance and 1971
command indicator

3,621,373 Mitchell Transient-free solid-state 1971
power

3,621,473 Stoffer Balanced modulator with JFET's 1971
voltage controlled resistors

3,621,510 Rollins Locking handle 1971

3,622,855 Hodgin Digital control device 1971

3,626,280 Van Englehoven Frequency controlled flux 1971
detector excitation

3,629,788 Hartley Electrical interconnect system 1971

3,631,350 Drake Synchronous counting apparatus 1971

3,631,487 Huntsinger Complementary search system 1971
for D.M.E.

3,633,112 Anderson Digital audio squelch 1972

3,633,133 Bise Narrow bandwidth mechanical 1972
filter using large area
coupling wires

3,636,450 Griffin Digital MOS FET characteristic 1972
tester

3,637,958 Haerther Cam-operated electric timing 1972
mechanism with improved
adjustable pin coding and
retaining structure

3,638,092 Kammerer Altitude preselect and capture 1972
system

3,638,099 Centala Self-excited inverter employing 1972
commutation time transformers

3,638,100 Centala Circuit to prevent a 1972
transformer from presenting a
low impedance upon core saturation

3,638,135 Stover Intermittent phase control loop 1972
for swept frequency pulse generator

3,638,148 Hallford Lid interaction protected 1972
shield enclosed dielectric
mounted microstrip

3,638,192 Rutherford Asynchronous pulse information 1972
clock phase imparted shift
register decoder

3,639,703 Bergemann Method and means for measuring 1972
weighted noise in a communication
link

3,639,740 Escoffier Ring counter apparatus 1972

3,639,821 Byers Electromagnet motor reversing 1972
control

3,641,572 Lundgreen Digital echo protection circuit 1972
for DME and TACAN

3,641,972 Hostetter Probe assembly 1972

3,646,367 Conant Electrical switch 1972

3,648,031 Neal Control system filtering 1972
technique

3,651,315 Collins Digital products inspection 1972
system

3,651,345 Lundgreen Voltage variable pulse delay 1972
monostable multivibrator

3,651,469 keese Binary touch-tune system 1972
with memory

3,654,597 Cox Command bar mechanism for 1972
flight director indicator
aircraft instrument

3,659,116 Sellers Power insensitive frequency 1972
detector

3,659,185 Gregorich Volt-second unbalanced 1972
compensated two core power
transformer

3,659,196 Bercovitz Phase detector using logic 1972
gating circuits

3,659,206 Hallford Microwave balanced mixer 1972
circuit

3,659,233 Hallford Microstrip RF variable 1972
attenuator

3,659,271 Collins Multichannel communication 1972
system

3,660,751 Bullinga DC-DC regulated inverter 1972
employing pulse-width modulation
with a constant volt-second
sensing transformer

3,662,290 Elliott Automatic control for amplitude 1972
modulated signal source

3,662,401 Collins Method of program execution 1972

3,663,931 Brown Pin and socket contact 1972
electrical interconnect system

3,665,323 Peterson Proportional digital control 1972
for radio frequency synthesizers

3,665,353 Campbell Solenoid with multi-rate return 1972
spring

3,665,358 Leuck Reactor coil form 1972

3,665,380 Stover Electronic aids for aquanauts 1972

3,665,470 Hemme Mistuned VOR receiver alarm 1972

3,668,534 Perry J-K flip-flop monostable 1972
multivibrator apparatus

3,668,542 Stoffer Audio compression circuit 1972

3,668,750 McAllister Automatic processing equipment 1972
for microelectronic circuits

3,670,693 Rorick Quarts crystal resonator tuning 1972
control apparatus

3,671,866 Rutherford Pulse processing circuit having 1972
improved range resolution

3,675,129 Melvin Differentially coherent phase 1972
shift keyed digital demodulatin
apparatus

3,676,654 Melvin Digitalized filter 1972

3,678,414 Hallford Microstrip diode high 1972
isolation switch

3,678,417 Ragan Planar R.F. load resistor for 1972
microstrip or stripline

3,678,433 Hallford RF rejection filter 1972

3,680,091 Rutherford Pulse train framing and 1972
intermediate pulse spacing
accuracy test circuit

3,680,097 Huntsinger All digital distance measuring 1972
equipment

3,681,759 Hill Data loop synchronizing 1972
apparatus

3,683,390 Cory HF broadband omnidirectional 1972
antenna

3,692,941 Collins Data exchange and coupling 1972
apparatus

3,692,956 Northrup Sealed magnetic tape cassette 1972
apparatus

3,693,112 Briggs Signal controlled wide range 1972
relaxation oscillator apparatus

3,693,229 Daebler Canned transistor-IC lead 1972
bender

3,696,428 Kemper ADF needle stabilizing circuit 1972

3,696,430 Cory High gain two bay 1972
unidirectional broadband antenna

3,697,861 Frazier Short circuit protected voltage 1972
regulator

3,697,893 Faustlin Microwave modulator having 1972
input modulation signal probe
with adjustable electrical
characteristics

3,697,999 Cory Rotatable bi-planar series-fed 1972
log-periodic HF antenna

3,698,516 Williams Centering device 1972

3,698,621 Burke Bonding apparatus 1972

3,699,324 Iliff Energy source tracking system 1972
employing drift-line technique

3,699,461 Huntsinger Analog harmonic rejecting 1972
phase detector

3,699,483 Peterson Rugged, narrow bandwidth 1972
mechanical filter

3,700,180 Sitz Cable winding apparatus 1972

3,701,034 Bruene Equalizer circuit for 1972
multistage feedback amplifier

3,701,936 Martin Fine & coarse synchro 1972
servomotor control including a
dual sin/cosine to DC converter

3,703,006 Sharma Algorithm for synthesizing 1972
economical data communication
network

3,703,679 Heidt Current regulator with delayed 1972
turn-off

3,705,530 White Force hub sensor for control 1972
wheel steering

3,706,136 Sielaff Vehicle maneuver indicator 1972

3,710,251 Hagge Microelectric heat exchanger 1973
pedestal

3,713,017 Vena Frequency shift keyed apparatus 1973

3,713,033 Frerking Digitally temperature 1973
compensated oscillator

3,714,375 Stover Secondary phase modulated 1973
communications service via
AM broadcast stations

3,714,603 Williford RC active filter apparatus 1973

3,716,794 Teggatz Frequency dividing apparatus 1973

3,716,864 Stover ILS receiver for aircraft with 1973
distortion warning or elimination

3,718,766 Stover Wide band multiplexing system 1973

3,718,928 Stover False VOR bearing indication 1973
monitor

3,721,959 George Method and means for detecting 1973
error rate of transmitted data

3,723,842 Sather Digital servo motor control 1973
with an error rate derivative
curve

3,723,871 Runyan Servo stabilized meter 1973
apparatus

3,723,886 Sather Pulse stretching apparatus 1973

3,723,890 Hutsinger Digital harmonic rejecting 1973
phase detector

3,725,828 Temes Asymmetrical loss-pole 1973
mechanical filter

3,727,134 Melvin Auto equalizer apparatus 1973

3,727,145 Huntsinger Digital modulo complementary 1973
phase detector

3,727,231 Galloway Collinear dipole antenna 1973

3,728,681 Fuller Data loop communication 1973
priority establishing apparatus

3,729,683 Hemme VOR 9960 Hz harmonic generator 1973

3,730,799 Scannell Method for metallic pattern 1973
definition

3,731,233 Hutchinson Minimum shift keying modulating 1973
apparatus

3,733,525 Robinson RF microwave amplifier and 1973
carrier

3,735,289 Bruene Transmitter combiner having 1973
couple tuned circuits

3,736,506 Griffin Method of testing integrated 1973
circuits

3,739,284 Stover VOR receiver immune to false 1973
bearing indication stemming
from adjacent channel
modulation components

3,743,775 Hutchinson Data demodulator apparatus 1973

3,743,971 Hemme VOR AM modulator 1973


3,745,465 Stover Detector of false VOR direction 1973
indication

3,746,981 Stone Electrical fault monitoring 1973
with memory

3,748,586 Johnson Frequency discriminator 1973
utilizing mechanical filter

3,749,897 Hirvela System failure monitor title 1973

3,750,177 Rooks Instrument landing system 1973
receiver monitor

3,750,456 Walker Means for determining heading 1973
alignment in an intertial
navigation system

3,755,660 Sather Digital word magnitude 1973
selection circuit apparatus

3,755,741 Stover Self-monitoring of radio 1973
receivers

3,755,746 Hogue Frequency comparison indicating 1973
apparatus

3,755,789 Collins Expandable computer processor 1973
and communication system

3,755,807 Brown Resistor-ladder circuit 1973

3,756,087 Riethmeier Hold-down/extraction apparatus 1973

3,757,226 Stover Digital means for improving the 1973
signal to noise ratio of repetitive
morse code-type signals

3,757,261 Sather Integration and filtration 1973
circuit apparatus

3,761,625 Bruene Digital method and means for 1973
frequency shift keying

3,761,691 Schultz Runway alignment system 1973
utilizing a lateral acceleration
signal

3,761,699 Sather Multiplication by successive 1973
addition with two's complement
notation

3,764,743 Melvin Data modem apparatus 1973

3,764,932 Robinson RF power amplifier 1973

3,767,210 Havens Magnetic tape cleaner apparatus 1973

3,772,597 Stover Code transmission system 1973

3,775,707 Frazier Method and means for antenna 1973
coupling

3,775,760 Strathman Cathode ray tube stroke writing 1973
using digital techniques

3,777,242 Tribuno Turn coordination control with 1973
dead space and limited washout

3,780,279 Stover Means for extending the 1973
identification range of radio
equipments using repetitive
coded identification signals

3,781,613 Robinson RF transistor carrier 1973

3,781,692 Escoffier Switching circuit apparatus 1973

3,781,764 Johnson Moisture seal for electrical 1973
connector

3,781,912 McCollum N-way analog signal fader 1973

3,787,785 Bass Phase representative digital 1974
signal modulating apparatus

3,794,928 Stump Frequency shift keyed 1974
demodulator

3,798,371 Melvin Data modem apparatus 1974

3,805,033 Manke Autopilot go-around mode pitch 1974
command signal computations

3,805,235 Foster Equalization means for multi- 1974
channel redundant control
system

3,807,010 Semrad Contact cleaning, gauging and 1974
adjusting means for printed
circuit board connectors

3,808,376 Melvin Three-channel data modem 1974
apparatus

3,809,819 Stephens TDM switching apparatus 1974

3,809,821 Melvin Three-channel data modem 1974
apparatus

3,809,867 Hattendorf Synthesis of bank and pitch 1974
signals utilizing rate and
acceleration input parameters

3,810,018 Stover Distortion compensator for 1974
phase modulation systems

3,810,100 Hungerford Looped direct switching system 1974

3,811,127 Griffee Antenna for airborne satellite 1974
communications

3,812,333 Mineck Lagged roll synchronization 1974
and washout means for aircraft
lateral axis control system

3,814,912 Manke Gust compensation for angle- 1974
of-attach reference airspeed
control system

3,815,850 Tribuno Crab angle reference signal 1974
development for limited forward
slip landing maneuver

3,816,718 Hall Synthesis of fail operational 1974
heading information (course
datum) from nonfail operational
input signals

3,816,733 Sather Bit serial divider with full 1974
scale capabilities

3,821,481 Melvin Three channel PSK data modem 1974
apparatus

3,822,047 Schuldt Takeoff and go-around climb- 1974
out profile pitch command
formulation for aircraft

3,823,015 Fassett Photo-masking process 1974

3,826,999 Williford FSK oscillator 1974

3,829,672 Sather Serial binary square root 1974
apparatus

3,831,094 Stover Means to prevent coincidental 1974
phase modulation in an amplitude
modulation transmitter

3,833,855 Lundgreen Coherent filter 1974

3,836,797 Steen Automatic intensity control 1974
for electronic displays

3,836,935 Johnson Moisture seal for electrical 1974
connector

3,837,603 Schultz Lateral axis rollout, go-around 1974
takeoff control for aircraft

3,838,415 Melvin Data modem apparatus 1974

3,842,358 Frazier Voltage standing wave ratio 1974
detecting and adjusting apparatus

3,845,414 McKenzie Shielding apparatus for a 1974
signal splitter and signal
splitter including the same

3,848,078 Guillot Hybrid electronic circuit 1974
employing meshed support

3,863,246 Treka Backlighted display apparatus 1975
for preventing direct viewing
of light sources

3,866,213 Sather Serial binary number and BCD 1975
conversion apparatus

3,925,621 Collins (AAC Inc) Digital circuit switched 1975
time-space-time switch equipped
time division transmission
loop system

3,956,593 Collins (AAC Inc) Time space time (TST) switch 1976
with combined and distributed
state store and control store

4,135,057 Bayless (AAC Inc) High density digital 1979
transmission system