Microprocessor controlled interface for cellular system
Patent 4718080 Issued on January 5, 1988. Estimated Expiration Date: 
December 16, 2005. 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.
December 16, 2005. 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 System for interfacing a standard telephone set with a radio transceiver Patent #: 4658096 InventorsApplicationNo. 06/809222 filed on 12/16/1985US Classes:455/74.1, Cordless/corded conversion455/552.1Operable on more than one systemExaminersPrimary: Dwyer, James L.Assistant: Ham, Mark E. Attorney, Agent or FirmInternational ClassH04Q 7/32 (20060101)AbstractA microprocessor-controlled interface for a cellular radio telephone system enables the user to communicate with such system by means of conventional telephony devices. A standard telephone outlet communicates with the transceiver logic bus through a microprocessor. Switches are provided for controlling the audio path between the handset and the transceiver of the mobile, vehicular-mounted unit in response to the status of the interface outlet. The microprocessor interprets both the transceiver bus and various signals generated by the operation of a device that is plugged into the interface so that the operation of the device is rendered fully compatible with the cellular system. The microprocessor is programmed to decode known manufacturer protocols whereby the interface is able to render itself compatible with various equipment types.Other References
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