Patents by Inventor Charles L. Wiggins

Charles L. Wiggins 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).

  • EMI line filter
    Patent number: 5619079
    Abstract: A filter circuit for reducing electromagnetic interference in an ungrounded hree-phase delta electrical system. The filter circuit includes a low- pass filter associated with each power phase having one input and output terminal placing an inductor in series with a phase conductor from a power supply. Input and output capacitors connect to a second input and output terminals respectively. An inductor connects in common between the second input and second output terminals thereby to complete a loop that is isolated from ground. Voltage suppression circuits connect from each phase to ground on the input side of the filter.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: April 8, 1997
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Charles L. Wiggins, David W. Stewart