Patents by Inventor Tatsuyoshi Katsumata

Tatsuyoshi Katsumata 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).

  • Turbomachine
    Patent number: 5707206
    Abstract: A turbomachine having an impeller rotating within a casing of the machine and groove passages are formed in a wall of the casing between an upstream portion and a downstream portion of the impeller and high pressure fluid is injected into the groove passages for increasing the stall margin without lowering the peak efficiency of the machine and prevents generation of a positive slope in a head-capacity curve.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: January 13, 1998
    Assignee: Ebara Corporation
    Inventors: Akira Goto, Tatsuyoshi Katsumata
  • Turbomachine
    Patent number: 5458457
    Abstract: In a turbomachine having an impeller rotating in a casing, nozzles are provided for forming an annular layer of fluid flowing along the inner surface of the casing. The annular flow layer is formed continuously or intermittently under control by detecting the occurrence of unstable characteristics of the turbomachine or a precursor of unstable characteristics, created by conditions represented by a positively-sloped region of the head-capacity curve of the turbomachine.
    Type: Grant
    Filed: August 26, 1993
    Date of Patent: October 17, 1995
    Assignee: Ebara Corporation
    Inventors: Akira Goto, Tatsuyoshi Katsumata, Masanori Aoki