Patents by Inventor Shigeharu Yamagishi

Shigeharu Yamagishi 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).

  • Device for plugging a hollow of a concrete pile
    Patent number: 4029128
    Abstract: A plug for a concrete pile having a hollow extending therethrough is in the form of inflatable bag made of impervious material and is secured in a portion of the follow adjacent the top end of the concrete pile in tight engagement with the inner surface thereof when the bag is in inflated position.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: June 14, 1977
    Inventor: Shigeharu Yamagishi