Patents by Inventor Warren J. Schmidt

Warren J. Schmidt 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).

  • Ratio ground relays
    Patent number: 4357644
    Abstract: Ratio ground induction disc relays for detecting open phases and phase-to-ground faults. An operating torque is applied to the induction disc which varies as a function of the zero sequence current. The phase currents are utilized in different arrangements to provide a restraining torque which varies as a function of predetermined different parameters, such as the sum of certain phase currents, the positive sequence current, or the positive sequence current minus the negative sequence current.
    Type: Grant
    Filed: March 20, 1981
    Date of Patent: November 2, 1982
    Assignee: Westinghouse Electric Corp.
    Inventor: Warren J. Schmidt