Patents by Inventor Bruce S. Preston

Bruce S. Preston 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).

  • Ground fault circuit breaker with mechanical indicator for ground fault trips
    Patent number: 4382270
    Abstract: A ground fault circuit breaker including ground fault interruption means and overload interruption means that are independently responsive to open a common set of breaker contacts upon respective ground fault and overload conditions is provided with a trip indicator visible external to the breaker that operates on actuation of the ground fault interruption means but not upon operation of the overload interruption means, the trip indicator being a mechanical device that is actuated upon the movement of the solenoid plunger that operates upon occurrence of a ground fault condition.
    Type: Grant
    Filed: April 7, 1981
    Date of Patent: May 3, 1983
    Assignee: Westinghouse Electric Corp.
    Inventors: Ronnie D. Davidson, Bruce S. Preston