Patents by Inventor Francis Johnson

Francis Johnson 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).

  • Machine tools
    Patent number: 3951019
    Abstract: A "transferred arc" plasma torch is mounted on a lathe tool post for the purpose of heating a workpiece by directing an ionised gas on it. The torch is spaced a fixed amount from the workpiece for operation but is movable to a further temporary position closer to the workpiece to facilitate initial striking of an electrical arc between the workpiece and itself.
    Type: Grant
    Filed: February 25, 1975
    Date of Patent: April 20, 1976
    Assignee: Rolls-Royce (1971) Limited
    Inventors: Reginald Francis Johnson, Thomas James Potts, Gordon Bridgman Jennings