Patents by Inventor Duane L. Cadden

Duane L. Cadden 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).

  • Salvage method for cathode ray tubes
    Patent number: 4176891
    Abstract: In a salvaging method for shadow mask containing glass cathode ray tubes whereby the glass funnel portion is separated from the face panel at the frit seal by etching the external portion of the seal and subsequently creating a thermal shock to fracture the frit seal by causing a temperature differential between the funnel and the panel, the improvement comprising protecting the mask with a chemically basic covering prior to separation to insulate the mask from any acidic material which might be present.
    Type: Grant
    Filed: September 25, 1978
    Date of Patent: December 4, 1979
    Assignee: GTE Sylvania Incorporated
    Inventors: Ermen S. Antonucci, Duane L. Cadden, Albert Regenbrecht, Edward Schwartz