Patents by Inventor John Brian Davis

John Brian Davis 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).

  • Cooling thermoplastics tubes
    Patent number: 4093412
    Abstract: Cooling an extruding thermoplastic tube by feeding the tube adjacent a cooling surface, maintaining a sheath of heat-transfer fluid between the tube and surface and preferentially cooling at least a selected area of the tube by transversely displacing the tube to decrease the thickness of the sheath between the selected area and the cooling surface. The invention is particularly suitable, for the production of thermoplastic films by orienting a cast tubular extrudate which has been cooled by means of an internal mandrel.
    Type: Grant
    Filed: September 23, 1976
    Date of Patent: June 6, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventors: John Brian Davis, Derek Skilling, Nigel Edwin Wrigley
  • Cooling thermoplastic tubes
    Patent number: 3993723
    Abstract: Cooling an extruding thermoplastic tube by feeding the tube adjacent a cooling surface, maintaining a sheath of heat-transfer fluid between the tube and surface and preferentially cooling at least a selected area of the tube by transversely displacing the tube to decrease the thickness of the sheath between the selected area and the cooling surface. The invention is particularly suitable, for the production of thermoplastic films by orienting a cast tubular extrudate which has been cooled by means of an internal mandrel.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: November 23, 1976
    Assignee: Imperial Chemical Industries Limited
    Inventors: John Brian Davis, Derek Skilling, Nigel Edwin Wrigley