Patents by Inventor Donald A. Urquhart

Donald A. Urquhart 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).

  • Tritium light
    Patent number: 4788437
    Abstract: A light assembly comprises a self-luminescent light source, a wave guide and output optics. The self-luminescent light source takes the form of a luminescent concentrator which is activated directly or indirectly by radioactive radiation, typically beta radiation from tritium.
    Type: Grant
    Filed: September 23, 1986
    Date of Patent: November 29, 1988
    Assignee: Landus Inc.
    Inventors: Donald A. Urquhart, Douglas Hart