Emergency light battery charger circuit
Patent 4150302 Issued on April 17, 1979. Estimated Expiration Date: 
April 25, 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.
April 25, 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 3573483 Battery charging and discharging system Patent #: 3939359 InventorApplicationNo. 05/790589 filed on 04/25/1977US Classes:307/66, Storage battery or accumulator362/183, Rechargeable electrical source of with external connections362/20AUTOMATIC SUBSTITUTION OF POWER SUPPLY OR LIGHT SOURCEExaminersPrimary: Hix, L. T.Assistant: Schreyer, S. D. Attorney, Agent or FirmInternational ClassesH02J 9/00 (20060101)H02J 7/00 (20060101) H02J 9/02 (20060101) AbstractA battery charger circuit for providing a charging current to a rechargeable battery from AC line voltage. The charger circuit is especially adapted for use in an emergency light and includes circuitry to provide automatic charging current shut-off when the battery is fully charged. Failure of AC power is detected by the charger circuit, and current is applied to an emergency lamp in response to such failure. Circuitry is included for monitoring the charge state of the battery and for interrupting discharge current to the lamp from the battery when the charge state falls below a predetermined limit. Provision is included for use of the battery charger circuit in a portable lantern configuration. | |
