Patents by Inventor Howard C. Ludwig

Howard C. Ludwig 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).

  • Puffer circuit breaker
    Patent number: 4199671
    Abstract: A puffer circuit breaker characterized by adjustable wall means for regulating the pressure of an arc-extinguishing gas between separating contacts.
    Type: Grant
    Filed: January 30, 1978
    Date of Patent: April 22, 1980
    Assignee: Westinghouse Electric Corp.
    Inventor: Howard C. Ludwig