Patents by Inventor Hirofumi Yuda

Hirofumi Yuda 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).

  • Rail-climbing elevator counterweight having flat machines
    Patent number: 6085874
    Abstract: An elevator system includes a counterweight assembly having a plurality of drive machines having integrally formed drive wheels adapted to frictionally engaged a guide rail for driving the counterweight assembly along the guide rail to effect movement of an elevator car.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: July 11, 2000
    Assignee: Otis Elevator Company
    Inventors: Yasunobu Uchino, Kenji Nakagawa, Hirofumi Yuda, Masaharu Ueda, Yasuhisa Shioda, Takayuki Nagashima