Patents by Inventor Richard E. Doenges

Richard E. Doenges 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).

  • Patent number: 3964915
    Abstract: An improved pattern material for the production of precision investment casting molds, the pattern material being characterized by a low injection temperature, a low coefficient of expansion and insubstantial cavitation after injection into a pattern die. The pattern comprises a mixture in which the predominating constituent is a mixture of stearic and palmitic acids, a thermoplastic resin which is compatible with the fatty acid-wax mixture employed in an amount less than the aforementioned mixture of fatty acids, a wax having a melting point by the ball and ring method of from 160.degree. to 180.degree.F (71.degree. to 82.degree.C) in an amount less than that of the thermoplastic resin, a fatty acid amide slip agent in an amount less than the amount of wax and a relatively small amount of at least one metal stearate.
    Type: Grant
    Filed: December 26, 1974
    Date of Patent: June 22, 1976
    Assignee: TRW Inc.
    Inventors: Richard E. Doenges, James E. Amelung