Patents by Inventor Donald R. Castle

Donald R. Castle 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).

  • Two-component phosphor in a cool white lamp
    Patent number: 4258285
    Abstract: Fluorescent lamps containing a two-component phosphor system consisting essentially of europium activated barium magnesium aluminate as a blue emitter and manganese and antimony activated calcium chlorofluorapatite as a yellow emitter use less energy to achieve at least comparable brightness as a standard cool white lamp with a suitable color rendering index.
    Type: Grant
    Filed: June 22, 1979
    Date of Patent: March 24, 1981
    Assignee: GTE Products Corporation
    Inventors: Charles F. Chenot, Donald R. Castle