Patents by Inventor Tak S. Ning

Tak S. Ning 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).

  • Subsynchronous relay
    Patent number: 3944846
    Abstract: A relay for detecting sustained subsynchronous current on a power system. The relay includes a filter network for separating subsynchronous current from synchronous current and a detector network for measuring the detected subsynchronous current.
    Type: Grant
    Filed: March 19, 1974
    Date of Patent: March 16, 1976
    Assignee: Southern California Edison Company
    Inventors: Maxwell A. Thompson, Tak S. Ning