Patents by Inventor Yuuichi Namura

Yuuichi Namura 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).

  • Lighting device for illumination and lamp provided with the same
    Patent number: 6222327
    Abstract: AC voltage is applied to a resonant unit provided with an inductor and a capacitor AC current is supplied to a discharged tube connected to one of the inductor and the capacitor according to the switching operation of the two power semiconductor elements connected in a bridge manner. The resonant unit and first and second voltage drop units are connected in series between I/O terminals of the bridge and the voltages of the first and the second voltage drop units are applied as signals of opposite phases to control terminals of the two power semiconductor elements.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: April 24, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Shoji, Hideki Miyazaki, Yuuichi Namura
  • Lighting device for illumination and lamp provided with the same
    Patent number: 6124680
    Abstract: AC voltage is applied to a resonant unit provided with an inductor and a capacitor AC current is supplied to a discharge tube connected to one of the inductor and the capacitor according to the switching operation of the two power semiconductor elements connected in a bridge manner. The resonant unit and first and second voltage drop units are connected in series between I/O terminals of the bridge and the voltages of the first and the second voltage drop units are applied as signals of opposite phases to control terminals of the two power semiconductor elements.
    Type: Grant
    Filed: June 11, 1998
    Date of Patent: September 26, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Shoji, Hideki Miyazaki, Yuuichi Namura
  • Industrial robot
    Patent number: D282077
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: January 7, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Abe, Masato Sibayama, Yuhiko Yabe, Ryouichi Hisatomi, Yoshiaki Yoshikawa, Yuuichi Namura, Takeshi Sasaki