Patents by Inventor Frank L. Whittaker

Frank L. Whittaker 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).

  • Electrical discharge lamp
    Patent number: 4135110
    Abstract: Electrical discharge lamps containing mixed halides of superior performance are provided by the inclusion in the lamp of a volatile complex halide compound of tin and sodium. The halide may be added as a mixture of tin and sodium halide but the complex is formed in operation of the lamp and has a much higher volatility than the constituent halides. The preferred lamps contain 5 to 100 micromoles tin and 1 to 250 micromoles sodium halide per cubic centimeter, in a gas fill containing more than 50 micromoles per c.c. mercury.
    Type: Grant
    Filed: September 8, 1977
    Date of Patent: January 16, 1979
    Assignee: Thorn Electrical Industries Limited
    Inventors: Alan G. Chalmers, Frank L. Whittaker, David O. Wharmby