Patents by Inventor Sirou Tsuda

Sirou Tsuda 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).

  • Magnetic fluid sealing device
    Patent number: 5876037
    Abstract: A magnetic fluid sealing device for preventing magnetic fluid from flowing out or spattering under the influence of rotation of a rotatable shaft, thereby preventing contamination of the surroundings. The device includes a pole piece 1 formed with a step portion 13 whose front end surface 4 is disposed more inwardly than the proximal end surface, and the surface of the step portion 13 opposed to a magnetic body 6 serves as a barrier wall 10. Thereby, magnetic fluid 7 is prevented from flowing out or spattering into the surroundings.
    Type: Grant
    Filed: November 19, 1996
    Date of Patent: March 2, 1999
    Assignee: Ferrotec Corporation
    Inventors: Hirohisa Ishizaki, Sirou Tsuda