Patents by Inventor Rex R. Holbrook

Rex R. Holbrook 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).

  • Vacuum delay valve
    Patent number: 3975609
    Abstract: A method of manufacturing an orifice delay valve having an apertured plate which is formed by coining a section in the plate, eroding a portion of the coined section by electrical discharge machining followed by ultra-sonic cleaning of the plate.
    Type: Grant
    Filed: May 10, 1974
    Date of Patent: August 17, 1976
    Assignee: Chrysler Corporation
    Inventors: Frank J. Martin, Rex R. Holbrook