Patents by Inventor Chang E. Kang

Chang E. Kang 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).

  • Apparatus and method for locating ground faults
    Patent number: 4546309
    Abstract: An apparatus for locating ground faults on direct current control systems includes a low frequency current generator having a variable output, a Hall-effect current probe for detecting the low frequency current produced by the generator, a filter and amplifier connected to the output of the Hall-effect current probe for identifying and amplifying the low frequency signal and a read-out element connected to the output of the amplifier to indicate the relative magnitude of the low frequency signal. A method for locating ground faults on direct current control system while the system is energized is described.
    Type: Grant
    Filed: September 13, 1982
    Date of Patent: October 8, 1985
    Assignee: Commonwealth Edison Company
    Inventors: Chang E. Kang, L. Alan Lowry, Merlin E. Burkum