Patents by Inventor Gerald K. Franklin

Gerald K. Franklin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Heater control apparatus for liquid crystal display with integral heater
    Patent number: 4723835
    Abstract: A heater control circuit for the integral heater of a liquid crystal display comprising solid state switches that simultaneously connect and disconnect the high side and low side of the heater from power and ground, respectively, in response to display temperature. A blend resistor is connected between the heater and ground to bleed off accumulated charge that would erroneously drive one of the solid state switches into conduction.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: February 9, 1988
    Assignee: Honeywell Inc.
    Inventor: Gerald K. Franklin
  • Keyboard switch
    Patent number: 4652704
    Abstract: An improved multiple circuit keypad switch of the type in which a rigid key having a shorting puck on its underside is supported over exposed traces of a printed circuit card by a flexible membrane so that the puck shorts designated exposed traces to close all circuits when the key is depressed, the improvement arising from the layout of the exposed traces in which individual circuits are arranged in concentric rings and the shorting puck contains shorting elements arranged in corresponding concentric rings.
    Type: Grant
    Filed: December 30, 1985
    Date of Patent: March 24, 1987
    Assignee: Sperry Corporation
    Inventor: Gerald K. Franklin