Automatic personnel monitoring system
Patent 4747120 Issued on May 24, 1988. Estimated Expiration Date: 
August 13, 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.
August 13, 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 ReferencesInventorAssigneeApplicationNo. 06/765343 filed on 08/13/1985US Classes:379/38, Personal monitoring (e.g., for the ill or infirm)340/573.4, House arrest system, wandering, or wrong place340/825.49, Location indication379/49Central station with plural substationsExaminersPrimary: Dwyer, James L.Attorney, Agent or FirmInternational ClassesG07C 1/00 (20060101)G07C 9/00 (20060101) G07C 1/20 (20060101) G08B 21/00 (20060101) G08B 21/02 (20060101) H04M 11/00 (20060101) AbstractA monitoring system for indicating the presence of a person at a remote location through a telephone line includes circuitry at a central location for automatically establishing a telephone link between the central and remote locations. A decoder at the remote location produces a verification signal in response to an action performed by the person whose presence is to be indicated. The decoder transmits the verification signal through the telephone line to the central location to indicate the presence of the person at the remote location.Other References
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