Keyboard-display combination
Patent 4274093 Issued on June 16, 1981. Estimated Expiration Date: 
February 26, 1999. 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 26, 1999. 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 3158317 3495232 3757322 Touch keyboard Money transfer device keyboard terminal Patent #: 4032931 InventorAssigneeApplicationNo. 06/015018 filed on 02/26/1979US Classes:345/174, Including impedance detection341/23Variable key legendsExaminersPrimary: Curtis, Marshall M.Attorney, Agent or FirmInternational ClassG06F 3/023 (20060101)AbstractA keyboard is constructed as an integral member of a display screen. The keyboard comprises a number of keys which are back-lighted upon the screen when they are enabled, but which are otherwise invisible to the viewer when disabled. When a key is depressed, the lit keyboard is reconfigured, a new set of keys enabled, and a system function is performed. | |
