Wrist watches
Patent 3938318 Issued on February 17, 1976. Estimated Expiration Date: 
February 17, 1993. 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.
February 17, 1993. 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 3560998 3613351 3672155 3722206 InventorAssigneeApplicationNo. 368372 filed on 06/08/1973US Classes:368/67, With auxiliary illumination for display307/38, Selectively connected or controlled load circuits345/102, Backlight control345/50, Liquid crystal elements368/70, Operated sequentially for distinct time data368/84, Liquid crystal display (i.e., LCD)968/933, Electrical, e.g., selection or application of the operating voltage, etc. [G04G 9/00D1C]968/962Using light valves, e.g., liquid crystals, etc. [G04G 9/12]ExaminersPrimary: Jackmon, Edith S.Attorney, Agent or FirmAbstractThere is disclosed a battery powered wrist watch utilizing solid state circuits and a liquid crystal display to eliminate mechanical parts. Complementary metal oxide semiconductor (CMOS) devices are used to drive liquid crystal display cells. The liquid cells dissipate only microwatts of power when energized and the CMOS devices require appreciable power only when switching from one state to the other. The combination of the liquid crystal display with the CMOS driving circuitry provides a low power, compact, portable watch. | |
