Patents by Inventor Kenneth F. Deffren

Kenneth F. Deffren 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).

  • Vessel for use in a microwave oven
    Patent number: 4144435
    Abstract: A vessel, reflective to microwave electromagnetic energy, having at least one aperture to permit passage of said microwave energy to its contents and a shielding device, responsive to a preselected internal temperature of the vessel contents, to close said at least one aperture to prevent further passage of said microwave energy to the vessel contents.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: March 13, 1979
    Assignee: The Procter & Gamble Company
    Inventors: Clarence O. Clark, Robert L. DeAngelis, Kenneth F. Deffren, Thomas J. Flautt, Erwin A. Hofmann, Eugene Weinshenker