Patents by Inventor John W. Harkins

John W. Harkins 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).

  • Sub-miniature tungsten halogen lamp with major inert gas and minor halide gas constitutes
    Patent number: 5359262
    Abstract: A low wattage sub-miniature, tungsten-halogen lamp having high efficacy and long life. The lamp has a cylindrical envelope in the T-1 to T-11/4 range containing a fill gas having a halogen minor constituent and an inert gas major constituent. The lamp operates at high fill gas pressures, and lower halogen gas content.
    Type: Grant
    Filed: August 31, 1992
    Date of Patent: October 25, 1994
    Assignee: Welch Allyn, Inc.
    Inventors: Dean A. Bell, John W. Harkins