Patents by Inventor Keizaburo Nishi

Keizaburo Nishi 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).

  • Shaft seal for slurry pumps
    Patent number: 5195755
    Abstract: A slurry seal assembly is provided which includes a casing, a flange fixed to the casing, a sleeve and seal cover located over a shaft and seal rings fitted into the sleeve through packings and in which parts of the surfaces of the members confronting a confined space are all protected by a synthetic rubber, thereby improving their resistance to slurry.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: March 23, 1993
    Assignee: Eagle Industry Co., Ltd.
    Inventors: Junji Ootsuka, Youichi Ogata, Keizaburo Nishi
  • Shaft seal for slurry pumps
    Patent number: 5129659
    Abstract: A shaft seal for slurry pumps is provided, wherein a dust lip is attached to the outer periphery of a rotary seal ring such that it extends from its one end positioned in a confining space over a packing for the rotary seal and terminates at its other end in front of a seal cover for the packing with a slight gap between them, thereby avoiding erosion of the packing by slurry and instabilization of the loads applied to the sliding surface of the seal rings by erosion of the dust lip.
    Type: Grant
    Filed: December 24, 1990
    Date of Patent: July 14, 1992
    Assignee: Eagle Industry Co., Ltd.
    Inventors: Junji Ootsuka, Youichi Ogata, Keizaburo Nishi
  • Quenching mechanism of shaft seal for slurry pumps
    Patent number: 5114160
    Abstract: A quenching mechanism for slurry pumps comprises a radial or inclined array of grooves at the rear end of a rotary seal ring. A quenching water, flowing along a fixed seal ring and through a gap between both the seal rings and a baffle sleeve, is forced to flow to the outer periphery of the rotary seal ring by the pumping action of the grooves, thereby achieving an increased cooling effect.
    Type: Grant
    Filed: December 24, 1990
    Date of Patent: May 19, 1992
    Assignee: Eagle Industry Co., Ltd.
    Inventors: Junji Ootsuka, Youichi Ogata, Keizaburo Nishi