Patents by Inventor Hiroshi Usida

Hiroshi Usida 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).

  • Power unit for hydraulic elevator
    Patent number: 5078236
    Abstract: A hydraulic elevator power unit has an oiltight type detector for detecting the number of revolutions of an electric motor. A leak oil hole formed in a lower end portion of the detector is connected to a leak oil tank. The operating oil entering the detector is discharged through the leak oil hole, thereby preventing the detecting portion from being immersed in the operating oil.
    Type: Grant
    Filed: September 27, 1990
    Date of Patent: January 7, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Motoo Shimoaki, Yoshio Kamiya, Yukihiro Takigawa, Hiroshi Usida, Tatsuro Miyake