Cellular telephone headset
Patent 5191602 Issued on March 2, 1993. Estimated Expiration Date: 
January 9, 2011. 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.
January 9, 2011. 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 ReferencesWireless telephone apparatus including both a telephone handset and a telephone headset Portable cordless telephone transceiver-radio receiver Telephone receiver transmitter device Portable hybrid communication system and methods Method and apparatus for controlling transmission of voice and data signals Patent #: 4991197 InventorsApplicationNo. 639430 filed on 01/09/1991US Classes:455/575.2, Headgear379/419, TERMINAL379/430, Body supported (e.g., headgear)455/565Restrictive dialing circuitryExaminersPrimary: Kuntz, CurtisAssistant: Cumming, William Attorney, Agent or FirmForeign Patent References
International ClassesH04M 011/00H04M 001/00 AbstractA telephone headset apparatus for use with an existing cellular telephone. The headset apparatus is modularly connectable to the existing cellular telephone system, and no electrical or mechanical modification of the existing telephone system is required. A "handset primacy" feature of the headset apparatus ensures that normal handset operation of the cellular telephone system is unaffected by the installation of the headset apparatus. In addition, the handset may remain resting in its cradle even while the headset is operated. A slave unit connects with the cellular telephone's transceiver unit, and a headset control unit connects both the headset and handset to the slave unit. The headset control unit contains a pushbutton for selecting headset operation, as well as a volume control dial for controlling the volume of sound reproduced by the headset's earpiece. The slave unit contains circuitry for controlling whether the handset, the headset, or both, are to be coupled to the telephone transmitting and receiving voice signal lines. The slave unit further contains circuitry for disabling the speaker-phone, if any, in the existing cellular telephone system when the headset is operational. A mounting tray inserts between the cellular telephone's cradle and mounting pedestal, keeping the headset control unit in an accessible location. Clips on the underside of the mounting tray allow excess lengths of headset cable to be safely and neatly stored. A retaining ring on the mounting tray provides a convenient resting area for the headset when it is not is use.Other References
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