Patents by Inventor Derek C. Gray

Derek C. 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 for quenching tubes
    Patent number: 4294796
    Abstract: Apparatus as set forth in U.S. Pat. No. 3,796,781 for the production of quenched tubes of plastics materials, wherein the peripheral portions of the caibrating disc assembly that contact the wall of the tube during operation of the apparatus comprise a liquid absorbent material.
    Type: Grant
    Filed: January 22, 1979
    Date of Patent: October 13, 1981
    Assignee: BXL Plastics Limited
    Inventors: James Jack, Derek C. Gray