Patents by Inventor Shun-ichi Nishizawa

Shun-ichi Nishizawa 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).

  • Antiexplosion structure in a working robot
    Patent number: 4698568
    Abstract: An antiexplosion structure in an electric motor drive type working robot includes a sealing structure for sealingly enclosing electric motors for driving the robot and wirings for the motors. Dry air is continuously fed into the sealing structure at a pressure higher than the environmental atmosphere. A pressure detector detects the pressure of the dry air within the sealing structure to permit electric current feed to the electric motors only when the detected pressure has a normal value.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: October 6, 1987
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Shun-ichi Nishizawa, Toshio Tsubota, Takashi Chikura