Patents by Inventor John J. Wilkinson

John J. Wilkinson 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).

  • Control means for drive equipment
    Patent number: 4155436
    Abstract: The circuit, which controls actuation of a clutch intermediate an electrical motor and a conveyor, is powered from a transformer which taps the power supply to the motor. The circuit contains a relay switch which is operable by a current sensor attached to the power supply line.
    Type: Grant
    Filed: November 12, 1976
    Date of Patent: May 22, 1979
    Assignee: Coal Industry (Patents) Limited
    Inventors: John J. Wilkinson, Harry Monks