Mobile Phone Technology
Patents and Inventions
Invented by Martin Cooper in 1973 (US patent No. 3,906,166)

The cell phone was invented by Martin Cooper et al. in 1973 (US patent No. 3,906,166).

Title Primary Class Description Inventor Assignee Issue Date Patent No.
Wireless Telephone 178/43 Means for electrically transmitting signals for securing telephonic communication between moving vehicles and way stations N. B. Stubblefield Conn Linn; R. Downs; B. F. Schroader; George C. McLarin; John P. McElrath; Jeff D. Roulette; Samuel E. Bynum May 12, 1908 US887357
Telephone signaling system 455/560 Telephone signaling system for transmitting supervisory signals between central office stations in cases in which facilities cannot be obtained by wire means, as in the case of radio speech channels and wire circuits, and to transmit such signals without the sacrifice of Mors telegraph facilities and without interference of voice currents with those signals. Charles S. Demarest American Telephone & Telegraph Company (AT&T) October 23, 1928 US1688453
Ringing circuit for radio transmitters 455/108 Howler or ringing circuit for short wave radio transmitters such as used for connection with police automobiles, calling the attention of the operator of a distant receiver with whom the operator of the transmitter wishes to establish contact. George W. Fyler; Schenectady L. Y. General Electric Company, New York December 3, 1935 US2023222
Radio telephone system 455/567 Radio telephone systems adapted for communications between ships and point ashore; to prevent false operation of the signal system caused by interfering frequencies. Albert Franklin Bowers American Telephone & Telegraph Company (AT&T) December 2, 1941 US2265056
Radiotelephone system 455/560 Radio telephone system involving an automatic exchange with connections extended over radio links Molnar Imre Automatic Electric Laboratories, Chicago September 26, 1950 US2523914
Control terminal for mobile radio telephone 455/455 Mobile Radio telephone system in which a multicity of mobile subscribers’ telephone stations are connected by radio to permanently located transmitting and receiving stations which are connected by wire lines to a central office or toll switchboard. Everhard H. B. Automatic Electric Laboratories, Chicago November 20, 1951 US2575782
Automatic selection of receiving channels 455/140 Radio telephone systems for interconnecting mobile radio stations with one another or with or with a radio station or telephone subscriber at a stationary position. Harry B. Coxhead Bell Telephone Laboratories, New York March 25, 1952 US2590234
Mobile radio telephone system 455/443 Mobile radio telephone systems providing more efficiently used means for handling a greater number of simultaneously calls between mobile units and fixed stations over a single frequency channel without causing interference. Albert E. Bachelet; Louis A. Dorff; Mitchell Doren Bell Telephone Laboratories, New York July 21, 1959 US2896072
Mobile communication system in which the base station receiver, which receives the strongest signal, is automatically selected 455/524 Mobile units in conjunction with fixed relay stations which receiver that receives the stronger signal will be voted to be automatically used; the choice of receiver will be re-voted upon change of location. Neal H. Shepherd General Electric Company, New York November 3, 1964 US3155909
Alarm circuits in portable radio telephone system 379/33 Wireless telephone systems with alarm circuits arranged to monitor and report the condition of the transmission links quality existing between stations in such a system Herbert W. Bryant Bell Telephone Laboratories, New York March 15, 1966 US3240879
Selector for selecting the best responding one of a plurality of equal rank devices 455/134 Selector Equipment for continuously selecting the best responding, one of a number of equal rank radio telephony devices Robert H. Duncan; Donald W. Orahood International Telephone and Telegraph Corporation (ITT), New York June 27, 1967 US3328697
Automatic mobile radio telephone switching system 455/560 Mobile telephone units including unique facilities for differentially selecting among called mobile units and for detecting “foreign” (roaming) mobile units in a particular mobile area Ralph A. Chaney American Telephone & Telegraph Company (AT&T) November 28, 1967 US3355556
Radio telephone system 455/437 A portable duplex radio telephone system includes at least one base station transmitter having a predetermined base transmission range, and a plurality of portable or mobile units each having a predetermined portable maximum transmission range predeterminately shorter than the base transmission range. Satellite receivers are deployed about the base station within the base station transmission range for receiving transmissions from the portable units. The base station transmitter transmits signals on a signalling channel and on at least one communications channel. Each transmitter signalling and communications channel has a frequency that is paired or associated with a receiving frequency of the satellite receivers. In a multiple base station system, the portable receiver has means for scanning the base station transmitter signalling frequencies and for tuning the portable transmitter to the signalling frequency associated with the frequency of the strongest signalling signal received from the base transmitter. When communication is initiated, the portable transmitter and receiver are automatically retuned to one of the communications channels as determined by the strongest signalling frequency received by the portable receiver and by channel availability. Means are also provided in the system to continuously locate a portable unit and switch the operating frequency thereof as the portable unit moves between base station transmitter coverage areas. Further means are provided to automatically reduce the output power of each portable transmitter to the minimum level required for satisfactory communications in order to reduce battery drain and the interference caused by the portable transmitters. Martin Cooper; Richard W. Dronsuth; Albert J. Mikulski; Charles N. Lynk, Jr.; James J. Mikulski; John F. Mitchell; Roy A Richardson; John H. Sangster Motorola, Inc., Chicago. September 16, 1975 US3906166

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