Patents by Inventor LeRoy N. Trowbridge

LeRoy N. Trowbridge 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).

  • Electronic motor control circuit
    Patent number: 4782271
    Abstract: A motor control circuit is utilized to monitor and control the power to two series connected 110-120 VAC motors, to detect an imbalance between the operation of the two motors, and to remove the power to both motors if one motor operates in an abnormal manner. A reference voltage is used and compared to the voltage level at the mid connection of the series connected motors.
    Type: Grant
    Filed: October 2, 1987
    Date of Patent: November 1, 1988
    Assignee: Music & Sound, Inc.
    Inventor: LeRoy N. Trowbridge