Patents by Inventor David A. Burnham

David A. Burnham 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).

  • Shut off check valve for a welding gun
    Patent number: 5378868
    Abstract: A shut off check valve for controlling cooling fluid flow to weld tips of a resistance welding gun. The valve is disposed within the weld gun housing and selectively interrupts cooling fluid flow between fluid inlet and outlet ports.
    Type: Grant
    Filed: March 12, 1993
    Date of Patent: January 3, 1995
    Inventors: James F. Burkhardt, Ronald R. Matheson, Daniel R. Burnham, David A. Burnham