Patents by Inventor Yoshiharu Watari

Yoshiharu Watari 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).

  • Method for improving soft ground by sand drain method and cylindrical bag for use in same
    Patent number: 4451175
    Abstract: Soft ground is improved by a sand drain method wherein a casing pipe is inserted in the soft ground followed by insertion of a cylindrical bag composed of a water-permeable material into the casing pipe; sand is filled in the cylindrical bag and then only the casing pipe is drawn out from the soft ground whereby a sand drain is constructed in the soft ground; and then, a load is imposed on the sand drain-constructed region to remove water through the sand drain and consolidate the soft ground. The diameter of at least a part of the cylindrical bag is capable of being increased when the consolidation load is imposed on the sand drain-constructed region.
    Type: Grant
    Filed: August 25, 1982
    Date of Patent: May 29, 1984
    Assignees: Teijin Limited, Penta-Ocean Construction Co., Ltd.
    Inventors: Hiromichi Yamashita, Yoshiharu Watari, Hideaki Mutsuro, Kenji Takagi