Patents by Inventor Robert C. Larson

Robert C. Larson 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).

  • Method of coating cathode heaters
    Patent number: 3940326
    Abstract: A solution containing dissolved tungsten and dissolved aluminum is spray dried to recover a tungsten-and-aluminum containing powder. The powder is then fired to eliminate hydrated water and volatiles and to convert the aluminum compound into alumina. The powder is next fired at a higher temperature in a reducing atmosphere to reduce the tungsten compound to elemental tungsten. A coating suspension containing the tungsten-alumina powder is then prepared and electrophoretically deposited on cathode heaters.
    Type: Grant
    Filed: February 16, 1972
    Date of Patent: February 24, 1976
    Assignee: GTE Sylvania Incorporated
    Inventors: Martha J. B. Thomas, Richard A. Fowler, Robert C. Larson