Patents by Inventor Clair D. Stewart

Clair D. Stewart 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).

  • Tungsten halogen lamp base
    Patent number: 4785218
    Abstract: A prefocused tungsten-halogen lamp including a vitreous envelope having a press-seal at one end thereof for receiving and supporting lead-in wires that in turn support a filament disposed in the envelope. The press-seal is received in an all ceramic base with a close fit with the sidewalls of the base, while leaving a void space under the press-seal that is filled with a sealing cement preferably injected into the void space through a hole in the ceramic base.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: November 15, 1988
    Assignee: GTE Products Corporation
    Inventors: Clyde B. Kohl, John F. Ellis, Clair D. Stewart