Patents by Inventor Edward Y. C. Hwang

Edward Y. C. Hwang 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).

  • Valve position sensing circuit
    Patent number: 5109675
    Abstract: The present invention provides a method and corresponding apparatus for detecting open and short circuit faults in a valve position sensor. According to one aspect of the invention, a fuel or steam valve (2) in a turbine system is automatically opened and closed by a positioner/sensor combination (1, 36, 32). In the event a fault occurs in the position sensing circuitry, a fault signal is immediately produced which allows appropriate action to be taken, e.g., closing the valve, before the turbine is damaged.
    Type: Grant
    Filed: October 10, 1990
    Date of Patent: May 5, 1992
    Assignee: Westinghouse Electric Corp.
    Inventor: Edward Y. C. Hwang