Patents by Inventor Hirochi Matsumoto

Hirochi Matsumoto 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).

  • Seals for cylindrical surfaces
    Patent number: 4971306
    Abstract: A shaft seal for sealing fluids includes a rotating shaft means having an axis and an external cylindrical surface. A seal ring is disposed about the shaft and has an internal cylindrical surface juxtaposed to the external cylindrical surface and mating therewith to form mating cylindrical surfaces. One of the cylindrical surfaces is a smooth cylindrical surface, and a plurality of spaced, generally parallel indentations are formed in the smooth cylindrical surface, the indentations extending at an acute angle relative to the axial direction of the shaft such that fluid entering the mating cylindrical surfaces is returned by the indentations as the shaft rotates.
    Type: Grant
    Filed: November 14, 1988
    Date of Patent: November 20, 1990
    Assignee: Eagle Industry Co., Ltd.
    Inventors: Takeshi Jinnouchi, Hirochi Matsumoto, Tetsuya Iguchi