Patents by Inventor Derek Cory Gray

Derek Cory Gray 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).

  • Extrusion processes and apparatus therefor
    Patent number: 3976410
    Abstract: Apparatus for use in the production of a tube of organic thermoplastic polymeric material wherein the peripheral portions of the calibrating disc assembly and the seal that contact the wall of the tube comprises a liquid absorbent material; and a method of producing the above tube.
    Type: Grant
    Filed: October 15, 1974
    Date of Patent: August 24, 1976
    Assignee: Bakelite Xylonite Limited
    Inventors: James Jack, Derek Cory Gray