Patents by Inventor Junji Otsuka

Junji Otsuka 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).

  • Mechanical seal
    Patent number: 4795167
    Abstract: A mechanical seal in which fins for causing a positive flow of fluid to be sealed are provided on the outer periphery of a seal cover carrying a seal ring so as not to accumulate a large quantity of slurry contained in the fluid to be sealed in the neighborhood of the seal.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: January 3, 1989
    Assignee: Eagle Industry Co., Ltd.
    Inventor: Junji Otsuka
  • Mechanical shaft seal
    Patent number: 4195853
    Abstract: A mechanical shaft seal has a seal ring made of rubber or the like elastic material and disposed between a housing and a floating seat. The seal ring has a poly-arcuate shape consisting of continuous arcuate portions of different diameters. The maximum outer diameter of the seal ring is larger than the inner diameter of the peripheral surface of a stepped recess formed in the housing, while the minimum inner diameter of the seal ring is smaller than the outer diameter of the peripheral surface of a stepped recess formed on the floating seat.
    Type: Grant
    Filed: September 21, 1978
    Date of Patent: April 1, 1980
    Assignee: Nippon Oil Seal Industry Co., Ltd.
    Inventor: Junji Otsuka