Method and apparatus for supervising battery energy level
Patent 4139846 Issued on February 13, 1979. Estimated Expiration Date: 
June 30, 1997. 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.
June 30, 1997. 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 3899732 Battery condition monitoring method and apparatus Patent #: 4024523 InventorAssigneeApplicationNo. 05/811827 filed on 06/30/1977US Classes:340/636.15, By voltage340/629, Ionization340/663UndervoltageExaminersPrimary: Caldwell, Sr., John W.Assistant: Myer, Daniel Attorney, Agent or FirmInternational ClassesG01R 31/36 (20060101)G08B 17/11 (20060101) G08B 17/10 (20060101) G08B 29/00 (20060101) G08B 29/18 (20060101) AbstractApparatus for supervising the energy level of a battery is characterized by circuitry for periodically loading the battery, monitoring the change in voltage across the battery from the condition prior to loading to during loading, and generating a signal whenever the change in voltage is at least equal to a predetermined magnitude. In one embodiment the apparatus is used with a fire detector powered by the battery, and the signal operates an alarm to indicate impending battery failure.Field of SearchIonization | |
