Patent No. Date Issued Subject

1697945 Jan. 8, 1929 Phasing of antennas with artificial lines

1989965 Aug. 5, 1931 Means for testing recorded sound -- automatic check film

1819589 Aug. 18,1931 H.H.B. % H.O. Peterson --Means for eliminating fading on high frequencies (filed1/2/26)

1849608 Mar. 15,1932 Frequency modulate or mark/space for AGC (automatic gain control)

1874865 Aug. 30, 1932 Acoustic combining system - mix reflections

1874866 Aug. 30, 1932 Method for eliminating fading -- basic rectifier telegraph

1888065 Nov. 15, 1932 Differential volume control for diversity artificial line

1917290 Jul. 11, 1933 H.H.B. & H.O. Peterson -- Rotating switch, diversity

1917291 Jul. 11, 1933 H.H.B. & H.O. Peterson -- Artifical line pickup delay, diversity

1987889 Jan. 15, 1935 H.H.B. & H.O. Peterson --Means for eliminating fading switch or different beats

2014581 Sept. 17, 1935 Remote control system for relay stations

RE19784 Dec. 10, 1935 Aerial system -- balanced bridge to reduce engine ignition noise of aircraft

2025190 Dec. 24, 1935 Multiplex signaling -- commutator and frequency change for multiplex

2028860 Jan. 28, 1936 Receiving system-rectifier high frequency for C.W. Hansell electrolytic recorder

2034738 Mar. 24, 1936 Radio telegraph repeater -- electronic, no relays

2067432 Jan. 12, 1937 Radio communication -- frequency diversity

2069831 Feb. 9, 1937 H.H.B. & H.O. Peterson -- Fading eliminator -- different beat notes

2070418 Feb. 6, 1937 Multiplex cable code with diversity receivers

2076361 Apr. 6, 1937 Crystal oscillator monitor for centralized control

2081730 May 25, 1937 Television system -- AGC based on density of film

2084760 June 22, 1937 System for radio spectography, horizontal sync on oscillograph

2095050 Oct, 5, 1937 Signaling-space between carrier and sidebands, phone

2112877 Aug. 5, 1938 Centralized control relay stations

2138134 Nov. 29, 1938 H.H.B. & G.S.W. Short signaling -- antennas cancel reflections

2144215 Jan, 17, 1939 Electrical energy measuring system frequency modulation

2146301 Feb 7, 1939 Warren Knotts & H.H.B. -- Frequency assignments for relay stations

2173156 Sept. 191 1939 Amplitude modulation reception -- change to phase modulation

2247743 Jul. 1, 1941 Antenna -- phased loop, basis RCA TV receiving antenna

2255374 Sept 9, 1941 System for noise reduction - noise random, signal in phase

2271909 Feb. 3, 1942 Ultra short wave noise elimination -- balance local noise vertical suppressor

2405991 Aug. 20, 1946 Secrecy system -- shift signals between multiplex channels

2414791 Mar. 4, 1947 Radio receiving system -- local oscillator varied by signal-noise bursts

2487513 Nov. 8, 1949 Radio relay system - frequency selection for relay stations