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| 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 |
