Patents by Inventor John F. Vandigriff

John F. Vandigriff 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).

  • Automotive control circuit
    Patent number: 4435649
    Abstract: An automotive Control Circuit is described which controls several electrical functions of an automotive electrical system. A digital encoded key enables ignition and electrical fuel pump circuits. The same circuits are utilized to provide an anti thieft circuit to disable the automotive electrical system when attempts are made to hot wire the auto ignition circuit.
    Type: Grant
    Filed: December 7, 1981
    Date of Patent: March 6, 1984
    Inventor: John F. Vandigriff