Duplex radio system utilizing time compression expansion
Patent 4525835 Issued on June 25, 1985. Estimated Expiration Date: 
October 6, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 6, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2056031 2948808 3573379 3636524 3827052 Radio communication system for simultaneous telecommunication between radio stations Transmitter/receivers capable of contemporaneous transmission/reception Patent #: 4349919 InventorsAssigneeApplicationNo. 06/433079 filed on 10/06/1982US Classes:370/280, Time division370/521, Time compression or expansion455/86Transmitter oscillator used as local oscillatorExaminersPrimary: Olms, Douglas W.Assistant: Rokoff, Kenneth I. Attorney, Agent or FirmInternational ClassesH04B 1/56 (20060101)H04B 1/54 (20060101) H04B 1/66 (20060101) H04M 1/72 (20060101) H04L 25/05 (20060101) H04B 7/26 (20060101) H04L 25/02 (20060101) H04M 1/725 (20060101) H04B 1/40 (20060101) Foreign Application Priority Data1981-10-13 GBAbstractA multichannel duplex radio system for cordless telephone in which digital information is sent between the two ends. The data is divided into blocks which are transmitted in a fraction of the original block length. The other time slots are used for the duplex return path and for other similar equipment operating nearby. A direct conversion radio receiver is used in which the local oscillator signal is modulated for transmission.Other References
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