Patents by Inventor Tadashi Nagashima

Tadashi Nagashima 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).

  • Patent number: 5097110
    Abstract: The known reflecting mirror for a laser beam conisting of a mirror base member and a high-reflectivity metal coating layer formed on the mirror base member for reflecting a laser beam, is improved so as to maintain a high mirror reflectivity without necessitating a cooling facility. The improvements reside in that a coating layer having a small diffusion coefficient is provided on the back surface side of the high-reflectivity metal coating layer, and/or in that at least one layer of dielectric coating layer or layers are provided on the surface of the high reflectivity metal coating layer.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: March 17, 1992
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Shoichi Hamada, Isao Shirasu, Tadashi Nagashima, Takashi Akaba, Shuhei Kuri, Takuya Kidera, Yasumi Nagura, Seiichi Kawaguchi, Takashi Ishide, Yoshio Hashimoto
  • Patent number: 4839495
    Abstract: An improved laser beam welding apparatus for an inner circumferential surface of a tube is disclosed herein, which apparatus comprises an elongated flexible tube containing an optical fiber extended along the length thereof so as to transmit a laser beam, position detecting means disposed in the vicinity of the top end of the flexible tube to determine relative positioning thereof with respect to a work tube in which the flexible tube is inserted, holding means provided with an expander and disposed adjacent to the position detecting means for holding the tip end of the flexible tube in the work tube, rotary drive means disposed closer to the tip end of the flexible tube than the holding means, a rotary cylinder connected to the rotary drive means to be rotated with respect to the flexible tube, guide means mounted on the rotary cylinder in a relatively rotatable manner with respect to the rotary cylinder and held in contact with the inner surface of the work tube for supporting the rotary cylinder in a conce
    Type: Grant
    Filed: July 21, 1988
    Date of Patent: June 13, 1989
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Takuya Kitera, Shoichi Urushibata, Masatoshi Sato, Tadashi Nagashima, Shoichi Hamada, Isao Shirasu, Yasumi Nakura, Michito Sakamoto, Takashi Ishide, Naruo Sakamoto, Masahiko Meka, Masaru Tomeoka