Patents by Inventor Shunji Mitani

Shunji Mitani 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).

  • Collapsible rubber dam
    Patent number: 5318381
    Abstract: In a collapsible rubber dam, a fastening portion of a flexible rubber sheet body is fixed on an upper spillway portion of an arch type concrete dam or on a riverbed of a river in a curved form in the longitudinal direction of the body.
    Type: Grant
    Filed: April 29, 1991
    Date of Patent: June 7, 1994
    Assignee: Bridgestone Corporation
    Inventors: Yasushi Enami, Shunji Mitani, Yoshihiro Sato