Pager with automatically illuminated display
Patent 4644350 Issued on February 17, 1987. Estimated Expiration Date: 
September 25, 2004. 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.
September 25, 2004. 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 3437004 3849979 Radio paging receiver having display control means Patent #: 4536761 InventorAssigneeApplicationNo. 06/654082 filed on 09/25/1984US Classes:340/7.55, Display116/263, With illumination340/7.32, Power control or battery saving340/7.61, Visual345/50Liquid crystal elementsExaminersPrimary: Brigance, Gerald L.Attorney, Agent or FirmInternational ClassesG08B 3/10 (20060101)G08B 3/00 (20060101) G08B 5/22 (20060101) Foreign Application Priority Data1983-09-26 JPAbstractA pager comprising a light sensor which is responsive to light externally illuminating the pager to generate a first signal when the sensed light is below a predetermined luminance value. The first signal is supplied to a coincidence gate which provides a coincidence output when it detects the coincidence of the first signal with a second signal that is generated when there is a message on a display. The coincidence output feeds a light source to illuminate the display to make it visible under poor lighting conditions.Field of SearchControlling light source intensity | |
