Electronic wristwatch with generator
Patent 5001685 Issued on March 19, 1991. Estimated Expiration Date: 
January 24, 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.
January 24, 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 ReferencesIllumination device for electronic timepiece Electronic equipment with solar cell Self-charging electronic timepiece Power supply for electronic timpiece Self-chargeable electronic timepiece with operating voltage checking Patent #: 4785435 InventorAssigneeApplicationNo. 304289 filed on 01/24/1989US Classes:368/204, Electrical368/203POWER SUPPLY DETAILSExaminersPrimary: Roskoski, BernardAttorney, Agent or FirmForeign Patent References
International ClassesG04B 001/00G04C 003/00 Foreign Application Priority Data1988-01-25 WOAbstractAn electronic wristwatch including an a.c. generator having an output which is rectified using a half-wave rectifier. The half-wave rectified output of the generator is stored in a capacitor serving as a secondary power supply. Booster circuitry is operable for increasing and decreasing the voltage of the secondary power supply which is then applied across an auxiliary capacitor used for powering the wristwatch. Additional circuitry provides a suitable voltage across the auxiliary capacitor for driving the watch when the voltage across the secondary power supply is at or below a predetermined level. A pair of detecting circuits detect the maximum and minimum permissible voltage levels of the secondary power supply and auxiliary capacitor. | |
