Patents by Inventor John M. Hartshorne

John M. Hartshorne 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).

  • Valve actuator control unit
    Patent number: D285717
    Type: Grant
    Filed: June 13, 1983
    Date of Patent: September 16, 1986
    Assignee: Quadrastat Corporation
    Inventors: Peter D. Adams, John M. Hartshorne
  • Valve actuator control unit
    Patent number: D286064
    Type: Grant
    Filed: June 13, 1983
    Date of Patent: October 7, 1986
    Assignee: Quadrastat Corporation
    Inventors: Peter D. Adams, John M. Hartshorne