Patents by Inventor James E. Hopwood

James E. Hopwood 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).

  • DC arc weld starter
    Patent number: 4950864
    Abstract: A system for starting an arc for welding uses three DC power supplies, a high voltage supply for initiating the arc, an intermediate voltage supply for sustaining the arc, and a low voltage welding supply directly connected across the gap after the high voltage supply is disconnected.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: August 21, 1990
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Richard H. Campiotti, James E. Hopwood