Patents by Inventor Gerald R. Cheal

Gerald R. Cheal 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).

  • Method of thermoforming and product made therefrom
    Patent number: 4220683
    Abstract: A method of thermoforming a thermo-plastics sheet carrying a protective layer of polyethylene on at least one of the surfaces of the sheet comprising heating the assembly of sheet together with its protective layer to above the softening point of the thermoplastic and subsequently stretching the assembly to a desired shape.
    Type: Grant
    Filed: November 2, 1978
    Date of Patent: September 2, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: Peter J. Barker, Gerald R. Cheal
  • Method of thermoforming
    Patent number: 4141771
    Abstract: A method of thermoforming a thermo-plastics sheet carrying a protective layer of polyethylene on at least one of the surfaces of the sheet comprising heating the assembly of sheet together with its protective layer to above the softening point of the thermoplastic and subsequently stretching the assembly to a desired shape.
    Type: Grant
    Filed: April 6, 1977
    Date of Patent: February 27, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventors: Peter J. Barker, Gerald R. Cheal