Patents by Inventor Yoshikazu Sekiguchi

Yoshikazu Sekiguchi 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 device
    Patent number: 4222575
    Abstract: A shaft sealing device using seal rings having a hook shaped portion defining an inner radial lip to engage and seal the shaft. The rings are positioned symmetrically with respect to a spacer to define a sealing liquid chamber between the shaft, the spacer and the lip portion. The spacer has liquid seal passages formed therein to introduce sealing liquid. The axial length of the lip portion is shorter than the axial hight of outer peripheral surface of the seal ring and the inner peripheral surface is tapered inwardly with respect to the axis of the shaft.
    Type: Grant
    Filed: March 21, 1979
    Date of Patent: September 16, 1980
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Yoshikazu Sekiguchi, Kenji Asano