Patents by Inventor John E. Wardrop

John E. Wardrop 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).

  • Timed contact switch
    Patent number: 5170313
    Abstract: A timed contact switch apparatus has a conventional pushbutton placing a main switch in an actuated state when the pushbutton is depressed. A timing circuit is activated by the pushbutton to provide power to activate an electromechanical latch which holds the main switch in its actuated state while the timing circuit times out. Preferably the timing circuit operation is initiated by output of a Hall sensor which is controlled by a magnet whose position is mechanically linked to the position of the pushbutton.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: December 8, 1992
    Assignee: Honeywell Inc.
    Inventors: James P. Miller, Ronald G. Cox, John E. Wardrop