Power-supply/battery back-up power supply/battery charger combination
Patent 4672293 Issued on June 9, 1987. Estimated Expiration Date: 
August 26, 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 26, 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 References 3603973 3721887 InventorApplicationNo. 06/769358 filed on 08/26/1985US Classes:320/128, With charging307/66Storage battery or accumulatorExaminersPrimary: Hickey, R. J.Attorney, Agent or FirmInternational ClassH02J 9/06 (20060101)AbstractPower supply comprising an AC to DC power supply and a DC to DC power supply and a DC battery charging circuit within a single device, which device provides continuous DC power to a load regardless of the presence or absence of the AC power source. | |
