Patents by Inventor David J. Lease

David J. Lease 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).

  • Method and apparatus for submerged arc welding
    Patent number: 6399912
    Abstract: A welding apparatus for submerged arc welding is disclosed. The welding apparatus includes a welding power supply and a wire feeder in electrical communication with the power supply. A torch is in electrical communication with the power supply and is adapted to deliver an electrode wire from the wire feeder to an arc. A flux system having a flow path for delivering flux to the arc includes a pinch valve disposed to open and close the flow path.
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: June 4, 2002
    Assignee: Illinois Tool Works Inc.
    Inventors: Robert D. Steenis, David J. Lease