Patents by Inventor David K. Tart

David K. Tart 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).

  • Gasket material formed of felt containing polyethylene terephthalate fibers
    Patent number: 4098942
    Abstract: Felt gasket material comprising polyethylene terephthalate fibers and suitable for use in luminaires is provided with improved compression recovery properties at elevated operating temperatures of the luminaire by heating the gasket material preferably in the range of 160.degree. C to 200.degree. C for a sufficient time to heat-set the fibers.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: July 4, 1978
    Assignee: General Electric Company
    Inventors: David K. Tart, Mitchell M. Osteen
  • Gasket material and method of making
    Patent number: 4059753
    Abstract: Felt gasket material comprising polyethylene terephthalate fibers and suitable for use in luminaires is provided with improved compression recovery properties at elevated operating temperatures of the luminaire by heating the gasket material preferably in the range of 160.degree. C to 200.degree. C for a sufficient time to heat-set the fibers.
    Type: Grant
    Filed: April 25, 1974
    Date of Patent: November 22, 1977
    Assignee: General Electric Company
    Inventors: David K. Tart, Mitchell M. Osteen
  • Luminaire filter material
    Patent number: 4029955
    Abstract: Air filter material suitable for use as a gasket in luminaires comprises a composite air-permeable felt made of a carbonized fiber material intermingled with a non-carbonized high temperature resistant fiber material.
    Type: Grant
    Filed: May 9, 1975
    Date of Patent: June 14, 1977
    Assignee: General Electric Company
    Inventor: David K. Tart