Patents by Inventor Keith E. Crouch

Keith E. Crouch 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).

  • Combination field chopper and battery charger
    Patent number: 4292578
    Abstract: A power transistor used in a chopper circuit to control field excitation of a vehicle motor when in a power mode is also used to control charging current from an a-c to d-c rectifier to the vehicle battery when in a battery charging mode. Two isolating diodes and a small high frequency filter inductor are the only elements required in the chopper circuit to reconfigure the circuit for power or charging modes of operation.
    Type: Grant
    Filed: August 13, 1979
    Date of Patent: September 29, 1981
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Robert L. Steigerwald, Keith E. Crouch, James W. A. Wilson