Portable cordless telephone transceiver-radio receiver
Patent 4591661 Issued on May 27, 1986. Estimated Expiration Date: 
August 15, 2004. 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.
August 15, 2004. 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 2528636 3586787 Portable telephone system having a battery saver feature Automatic control system for condition-responsively switching over transceiver and radio or tape recorder audio signals Cordless telephone Sound powered headset Cordless telephone switch and line selector Patent #: 4484029 InventorsAssigneeApplicationNo. 06/641124 filed on 08/15/1984US Classes:455/556.1, Integrated with other device455/462Including private cordless extension systemExaminersPrimary: Rubinson, Gene Z.Assistant: Lev, Robert Attorney, Agent or FirmInternational ClassesH04M 1/72 (20060101)H04M 1/05 (20060101) H04B 1/40 (20060101) H04M 1/04 (20060101) H04M 19/00 (20060101) H04M 19/04 (20060101) H04M 1/725 (20060101) AbstractA portable cordless telephone transceiver-radio receiver includes a headset which is driven by the audio output of a radio receiver until an incoming radio frequency (RF) telephone ring signal is detected by a telephone receiver. A telephone audio ring signal is generated based on the detected RF ring signal and the audio ring signal is converted to sound at the headset. The audio ring signal operates a latch which blocks or squelches the audio output of the radio receiver from the headset until the latch is reset. A "talk/off" switch is operated by the user to initiate and terminate conversation and to automatically reset the latch. In another embodiment, the radio receiver is squelched or turned off directly by the "talk/off" switch. In a further embodiment, the audio ring signal is blocked from the head set until a prescribed number of audio ring signals have been detected.Other References
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