Patents by Inventor Frank Gordon Duncan, Jr.

Frank Gordon Duncan, Jr. 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).

  • Friction stir heating/welding with pin tool having rough distal region
    Patent number: 6726084
    Abstract: A stir friction pin tool has at least a portion of its distal end or tip which is either more rough than the cylindrical portion of the pin tool, or which has a surface roughness greater than 128 &mgr;″ regardless of the roughness of the cylindrical portion. The pin tool may include machined holes or slots, or may have an etched tip surface. The roughness aids in generating heat during the plunging portion of a stir friction welding or heating operation, to thereby reduce the overall time required for the operation.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: April 27, 2004
    Assignee: Lockheed Martin Corporation
    Inventor: Frank Gordon Duncan, Jr.