Patents by Inventor Gary A. Harkiewicz

Gary A. Harkiewicz 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).

  • Direction sensing system for an AC power supply and AC motor drive with such direction sensing system
    Patent number: 4710703
    Abstract: The direction of rotation of a three-phase voltage is determined by simultaneous reading of counters triggered by the respective phase zero crossings. Such determination is used in an AC motor drive to dispense of using a tachometer.
    Type: Grant
    Filed: January 15, 1986
    Date of Patent: December 1, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: Gary A. Harkiewicz, Paul W. Wagener