Dialing features for cellular telephone with standard telephone set
May 10, 2009. 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 ReferencesControl circuitry for a radio telephone Control circuitry for a radio telephone Cordless telephone having a remote control function System for interfacing a standard telephone set with a radio transceiver Microprocessor controlled interface for cellular system Programmable system for interfacing a standard telephone set with a radio transceiver System for interfacing a standard telephone set with a radio transceiver Patent #: 4775997 InventorsAssigneeApplicationNo. 349731 filed on 05/10/1989US Classes:455/74.1, Cordless/corded conversion455/411, Privacy, lock-out, or authentication455/557Interface attached device (e.g., interface with modem, facsimile, computer, etc.)ExaminersPrimary: Ng, Jin F.Assistant: Augustus, Jhancy Attorney, Agent or FirmForeign Patent References
International ClassH04M 011/00AbstractA unique cellular telephone (100) connects to a standard telephone set (101) for providing cellular telephone services to subscribers in remote locations not served by a landline telephone system. Cellular telephone (100) includes a cellular telephone transceiver (109), microcomputer (108) and circuitry (102-106) for interfacing the cellular telephone transceiver (109) to the telephone set (101). The interface circuitry (102-107) provides the audio, voltage and dial signal interface to the telephone set (101). The microcomputer (108) controls the interface circuitry (102-106) and is responsive to the telephone set (101) for answering and placing cellular telephone calls. The microcomputer (108) also is responsive to dialing sequences including numerical digits preceded and followed by the # digit for selecting cellular telephone features.Other References
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