Patents by Inventor John G. Leung

John G. Leung 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).

  • Constant temperature welding method
    Patent number: 4849600
    Abstract: A method for welding two pieces includes juxtaposing the pieces and monitoring the temperature of the region to be welded. Energy is applied at a time rate sufficient to raise the temperature of the region to be welded at a rate exceeding a predetermined value. Once a predetermined temperature is reached, that temperature is held for a predetermined time. The rate of rise of temperature is 70% of the final or predetermined temperature in 20% of the predetermined time. After the weld is made, the rate of fall of the temperature exceeds a predetermined value. Quenching may be used to achieve the desired rate of fall.
    Type: Grant
    Filed: August 22, 1988
    Date of Patent: July 18, 1989
    Assignee: General Electric Company
    Inventors: Roman Herschitz, Scott T. Demarest, Stephen H. Chu, John G. Leung