Patents by Inventor Keiichi Hagiya

Keiichi Hagiya 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).

  • Spinning reserve device for a water-wheel
    Patent number: 3985464
    Abstract: A device whereby water leaking through the guide vanes while the water-wheel is in spinning reserve can be drained through leak drain pipes which open in the fixed member near the outer periphery of the runner.
    Type: Grant
    Filed: September 25, 1974
    Date of Patent: October 12, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Takeo Hachiya, Keiichi Hagiya
  • Hydraulic machines and operating method thereof
    Patent number: 3945754
    Abstract: A hydraulic machine, such as a reversible pump-turbine, is provided with an automatic air vent valve disposed in the casing area and a conduit having a valve for providing direct fluid communication between the casing area and the draft tube, in addition to compressed air means for depressing the water level within the draft tube below the runner, when the guide vanes are closed so that the runner may be rotated substantially only within air.
    Type: Grant
    Filed: August 5, 1974
    Date of Patent: March 23, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Keiichi Hagiya, Mamoru Maki, Hiroshi Ogawa, Takeo Hachiya, Kiyozo Ochiai