Early FM Radio. Frost, Gary L. Published by Johns Hopkins University Press. For additional information about this book
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1 Early FM Radio Frost, Gary L. Published by Johns Hopkins University Press Frost, L.. Early FM Radio: Incremental Technology in Twentieth-Century America. Baltimore: Johns Hopkins University Press, Project MUSE., For additional information about this book No institutional affiliation (12 Nov :14 GMT) This work is licensed under a Creative Commons Attribution 4.0 International License.
2 appendix FM-Related Patents, Patents are listed in order of filing date. Except for Poulsen s Danish Patent No. 5,590, all patents shown are U.S. patents, which can be viewed on the U.S. Patent and Trademark Office Web page,
3 144 Ehret, Cornelius D. Ehret, Cornelius D. Poulsen, Vlademar Hammond, John Hays, Jr. Hewitt, Peter Cooper Nelson, Edward L. Day, Albert V. T. Taylor, Albert Hoyt Nyman, Alexander Art of Transmitting Intelligence of Transmitting Intelligence Method for Generating Alternating Current with High Frequencies Radio Telegraphy and Telephony of Electrical Distribution Modulating and Transmitting Method and Means for Electrical Signaling and Control Simultaneous Transmission or Reception of Speech and Signals Combined Wireless Sending and Receiving First FM patents. Antifading. None 785, Feb Mar First FM patents. Antifading. None 785, Feb Mar Arc oscillator using FSK None 5,590 (Danish) FSK for telegraphy. Amplitude modulation for telephony. FM transmitter with conducting gas or vapor oscillator 9 Sept Apr None 1,320, May Nov None 780, Dec Feb FSK with audion amplifier WE 1,349,729 8 Mar Aug FSK telegraphy, with AM of two wavelengths None 1,885, Jan Oct None 1,376, Apr Apr Uses a Poulsen arc WEM 1,615, July Jan Little, Donald G. Wireless Telephone WEM 1,595, June Aug Conrad, Frank Wireless Telephone FM transmitter WEM 1,528, Mar Mar. 1925
4 Purington, Ellison S. Radiant Signaling Transmitter and receiver. Wobble from a wave length of 505 to 526 meters, which would cause the mean value of the wave length to be meters. Corresponds to a center frequency of 581,851 cps, with a frequency swing of 23,703 cps. JHH 1,599, Apr Sept Mertz, Pierre Sivian, Leon J. Schelleng, John C. Shanck, Roy B. Hartley, Ralph V. L. Wright, George Maurice, and Smith, Sidney Bertram Long, Maurice B. Electrical Transmission of Pictures Means and Method for Signaling by Electric Waves Electric Wave Signaling Picture Transmitting Electric-Wave-Modulating Radio Transmission and Reception of Pictures Electrical Transmission Transmitter and receiver. FM for wired transmission of pictures. Limiter. Transmitter and receiver. Describes a narrowband FM system with a channel width of 4,000 cycles. AT&T 1,548, Jan Aug WE 1,847,142 5 Dec Mar Transmitter and receiver WE 1,653, Dec Dec Transmitter and receiver AT&T 2,115, Mar May 1938 Transmitter and receiver. Limiting in FM for pictures. Antifading. Antistatic. WE 1,633,016 7 July June 1927 RCA 1,964, Feb June 1934 Transmitter and receiver WE 1,977, May Oct Mohr, Franklin Transmission Transmitter only WE 1,715, May June 1929 Coleman, John B. Transmitting Transmitter only. Electronic coupled telegraph keying. Alexanderson, Ernst F. W. WEM 1,920,296 7 Aug Aug Transmission of Pictures Transmitter and receiver. Antifading. GE 1,830,586 9 Aug Nov. 1931
5 Demarest, Charles S. Signaling Transmitter and receiver. Limiting in FM receiver. AT&T 2,047,312 1 Dec July Conrad, Frank Chireix, Henri Radio Communication Means for Radio Communication Transmitter and receiver. FM balanced discriminator. Transmitter and receiver. Efficient phase modulation. WEM 2,057, Mar Oct None 1,882,119 6 May Oct Radio Telephone Signaling Transmitter and receiver. Narrowband FM. None 1,941, May Dec Trouant, Virgil E. Peterson, Harold O. Radio Transmitting Signaling by Frequency Modulation Electronic modulation. Improvement on Conrad Patent No. 2,057,640. Transmitter and receiver. Use of FM to narrow channel width. Antifading. WEM 1,953, June Apr RCA 1,789, July Jan Radio Signaling FSK None 2,082,935 6 Aug June 1937 Usselman, George Lindley Communication by Frequency Variation Transmitter and receiver. Wobbling. Multiplexing. Balanced frequency modulator. Spectrum conservation. Receiver limiting. Magnetic wobbler or capacity variation or resistance modulation. Transmitter and receiver. Uses balanced circuits in transmitter to suppress harmonics and ensure a constant amplitude. Trouant, Virgil E. Radiotransmitting Transmitter only. Crystal-controlled oscillator. Narrowband FM. Albersheim, Walter S. Method and Means for Signaling by Frequency Fluctuation Transmitter and receiver. Improved linearity when modulating with small frequency deviation. RCA 1,819, Aug Aug RCA 1,794,932 1 Sept Mar WEM 1,872,364 8 Oct Aug RCA 1,999, Jan Apr. 1935
6 Jones, Lester L. Variable Relay Condenser Nonmechanical high-speed variable condenser for FM None 1,777,410 6 Mar Oct Oscillation Generation A more stable FM transmitter. Antifading. RCA 1,787, Mar Jan Transmitter only. Narrower channel width and antifading. Wobbler. Greater efficiency. RCA 1,830, Mar Nov Trouant, Virgil E. Radio Station Transmitter and receiver WEM 1,861,462 3 May June Potter, Ralph K. Electrooptical Image- Producing Transmitter and receiver. Phase modulation for pictures. Signaling Transmitter and receiver. Multiplex signaling on a high frequency carrier. Limiter in receiver. Signaling Transmitter and receiver. Antifading. Limiter in receiver. Heterodyne in transmitter. Spectrum conservation. Beverage, Harold H. Signaling Transmitter and receiver. Spectrum conservation. Antifading. Detection of Frequency Detection of Frequency Detection of Frequency Receiver only. Circuit to limit the amplitude of the received alternating energy so greatly that the output current is practically square in wave form. Receiver only. Limiter circuit. Alternative to slope detector. Makes more linear the resonance curve used in detection. AT&T 1,777, May Sept RCA 2,103,847 2 Oct Dec RCA 1,803,504 5 Oct May 1931 RCA 1,849, Nov Mar RCA 1,813, Jan July 1931 RCA 1,867,567 1 Feb July 1932 RCA 1,938,657 1 Feb Dec. 1933
7 148 Ranger, Richard Howland Hammond, John Hays, Jr. Hammond, John Hays, Jr. Hammond, John Hays, Jr. Wobbled Frequency Superheterodyne Transmission of Light Sequences by Frequency Variation Transmission of Intelligence by Frequency Variation Transmission of Light Variations by Frequency Variations Transmitter and receiver RCA 1,830, Mar Nov Transmitter and receiver. FM, for both radio and light waves. None 1,977, May Oct Transmitter and receiver None 1,977, May Oct Transmitter only. FM of radio and light waves. None 2,036, May Apr Frequency Changer Used to wobble a transmitter frequency RCA 1,874, June Aug Böhm, Otto Signaling by Frequency Modulation Transmitter only. Simple FM modulation of a crystal oscillator. Dome, Robert B. Transmitter only. Gives as a practical example a frequency swing of 20,000 cycles, after multiplying by 100. TGFDT 1,874,869 8 July Aug GE 1,917, July July 1933 Schriever, Otto Signaling Transmitter and receiver TGFDT 1,911,091 3 Sept May 1933 Van Der Pol, Balthasar Device for Modulating the Frequency of Electric Oscillations Transmitter only. Uses light-sensitive cells to frequency-modulate high-frequency oscillations. Signaling Transmitter only. Limits the channel width of the transmitter with a bandpass filter. RCA 1,876, Nov Sept RCA 1,849, Jan Mar Day, Albert V. T. Carrier Wave Signaling Transmitter and receiver None 2,164, Feb June 1939
8 149 Detection of Frequency Transmitter only. Long-line frequency controlled oscillator. Roberts, Walter van B. Receiver only RCA 1,922, May Aug RCA 2,027, June Jan Transmitter only RCA 1,917, July July 1933 Radio Signaling Transmitter and receiver None 1,941, July Dec Goldstine, Hallan Eugene Wasserman, Marian George Modulation of Oscillations Increased efficiency RCA 2,067, Jan Jan Frequency Multiplication Applicable to FM and phase modulation CGTSF 1,964, Feb June 1934 Lindenblad, Nils E. Modulation Transmitter only. Eliminates AM components from FM components and vice versa. Electronic modulation of ultra-shortwave oscillations. Wolcott, Carl Frederick Reception of Phase Modulated Waves RCA 1,938, Mar Dec Receiver only RCA 2,114, Sept Apr Communication None 1,972, Sept Sept Phase Modulation Transmitter and receiver RCA 2,081, Jan May 1937 Phase Modulation Receiver Frequency or Phase Modulation Limits the frequency band of the receiver to the band occupied by the signal. This results in minimum noise and interference. RCA 2,101, Jan Dec Transmitter only RCA 2,085, Apr July 1937
9 Roosenstein, Hans Otto Modulation Transmitter only. High-speed modulation. TGFDT 2,001,891 5 May May 1935 Signaling Transmitter and receiver. Antifading. RCA 1,999, May Apr Usselman, George Lindley Phase and Frequency Modulation Transmitter only. Antifading. RCA 2,036,165 8 June Mar.1936 Signal Receiver FM and phase modulation RCA 2,229, June Jan Signal Receiver FM and phase modulation RCA 2,230, June Jan Transmitter only. Push-pull oscillator. RCA 2,032,403 9 July Mar Electrical Circuits Transmitter only. Elimination of amplitude modulation in a phase modulation or FM system. Conklin, James W. Transmitter only. Magnetron oscillator, followed by amplitude limiter. RCA 1,999, Oct Apr RCA 1,965, Dec July 1934 Turner, Alfred H. Secret Signaling Transmitter only RCA 2,026, Dec Jan Lindenblad, Nils E. Short Wave Signaling Transmitter only RCA 2,052, Jan Sept Conklin, James W. Receiver Phase modulation and FM RCA 2,091, Jan Aug Radiosignaling Wideband FM None 1,941, Jan Dec Radiosignaling Wideband FM None 1,941, Jan Dec George, Ralph W. Receiving Means Carrier frequencies of 70 cm (428 mc). Uses IF amplifier 600 kilocycles wide, of sufficient width to make its use in television desirable. RCA 2,035, Apr Mar. 1936
10 151 Philpott, La Verne R. Usselman, George Lindley Bechmann, Rudolf, and Elstermann, Herbert Facsimile Transmission Variable Reactance Modulator Circuit Apparatus Transmitter only WEM 2,070, June Feb Rapid modulation of FM and phase modulation systems RCA 2,121, July June 1938 Transmitter only RCA 2,030, Sept Feb Transmitter only TGFDT 2,076, Nov Apr Lindenblad, Nils E. Modulation Transmitter only. Used in the transcontinental test between Bolinas and Riverhead. Chaffee, Joseph G. Modulating for Ultra Short Waves RCA 2,054, Nov Sept Transmitter only. Adaptable for FM. BTL 2,038, Dec Apr Receiving Phase modulation and FM RCA 2,060, Dec Nov Receiver Receiver only. FM, AM, or phase modulation. Conklin, James W. Phase Modulation Receiver Detection RCA 2,064, Dec Dec Receiver only RCA 2,112, Dec Apr RCA 2,095, Mar Oct. 1937
11 152 Phase and Amplitude Modulation Receiver Phase and Frequency Modulation Wave Receiving Radio Transmitting Radio Transmitting RCA 2,019,446 9 Apr Oct RCA 2,087,429 6 June July 1937 None 2,063, Sept Dec None 2,098, Sept Nov Radio Signaling None 2,104, Sept Jan Multiplex Radio Signaling None 2,104, Sept Jan Radio Receiving None 2,116, Sept May 1938 Conrad, Frank Receiving Simultaneous AM and FM reception WEM 2,151, Sept Mar Usselman, George Lindley Seeley, Stuart William Roberts, Walter van B. Chaffee, Joseph G. Oscillation Generator and Frequency Modulator Detection of Frequency Frequency Variation Response Circuits Electric Phase Controlling Circuit Receiving for Frequency Modulated Waves RCA 2,160,466 5 Oct May 1939 RCA 2,071, Oct Feb Applicable to FM detection RCA 2,121, Oct June 1938 RCA 2,215,127 9 Nov July 1938 BTL 2,118, Dec May 1938
12 153 Chaffee, Joseph G. Reception of Frequency Modulated Waves BTL 2,075, Mar Mar Radio Receiving None 2,116, Aug May 1938 Circuits Improved balanced receiver RCA 2,179, Nov Nov Bown, Ralph BTL 2,212, Apr Aug Chaffee, Joseph G. Radio Repeater Improved repeaters for FM BTL 2,148, Apr Feb Roder, Hans Means and Method for Relaying Frequency Radio Rebroadcasting Means for Receiving Radio Signals Frequency-Modulated Carrier Signal Receiver Allows a weaker signal to break into a stronger signal GE 2,270, Nov Jan None 2,264, Jan Dec None 2,276, Jan Mar None 2,290, Jan July 1942 None 2,318, Jan May 1943 None 2,540, Jan Feb Current Limiting Device None 2,295,323 2 Aug Sept Method and Means for Transmitting Frequency None 2,315,308 2 Aug Mar. 1943
13 154 Roberts, Walter van B. Means and Method for Relaying Frequency None 2,275, Sept Mar RCA 2,289, Oct July 1942 Signaling None 2,323, Oct July 1943 Radio Signaling None 2,602, Mar July 1952 Multiplex None 2,630,497 1 June Mar. 1953
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