Patents by Inventor Tsugio Yamada

Tsugio Yamada 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).

  • Laser welding method
    Patent number: 4745257
    Abstract: A laser welding method and apparatus for welding stacked coated members in which voids in the welds are positively eliminated. A spacer is disposed between the two members to be welded. This provides a path for discharging gas formed by heating the coating material. The method and apparatus of the invention are useful for the laser welding of base members coated with metals having a lower melting point than the metal of the base, paints and oils. Preferably, the width of the gap is in a range of 0.1 mm to 0.5 mm.
    Type: Grant
    Filed: April 14, 1987
    Date of Patent: May 17, 1988
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Naotake Rito, Masao Ohta, Tsugio Yamada, Junichi Gotoh, Tsutomu Kitagawa