Patents by Inventor Severne Johnson

Severne Johnson 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).

  • Current sensing relay
    Patent number: 5004954
    Abstract: A three pole relay which operates in response to the flow of normal operating current across fluorescent lamps to activate a coil, the coil coperating a relay to open switches disposed in all of the filament lines associated with the lamp to shut off filament current while maintaining current flow across the lamps themselves.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: April 2, 1991
    Assignee: Texas Instruments Incorporated
    Inventors: Lawrence P. Kleven, Edward A. Agranat, Jerry Crisafulli, Hugh Robinson, David J. Smith, Thomas Wiseley, Richard C. Fortier, Severne Johnson, Marvin Menzin