Patents by Inventor Walter D. Cottrell

Walter D. Cottrell 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).

  • Low temperature maturation of sheet molding compositions
    Patent number: 4246210
    Abstract: Composite sheets of low pressure molding compounds sandwiched between films of polyethylene are thickened to a viscosity at which the film can be stripped from the composite by the application of low temperatures to at least the surface of the sandwiched composite.
    Type: Grant
    Filed: August 4, 1978
    Date of Patent: January 20, 1981
    Assignee: Owens-Corning Fiberglas Corporation
    Inventors: Edward L. Wilson, Walter D. Cottrell, Robert J. Gelin