Patents by Inventor Mitsuji Ishida

Mitsuji Ishida 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 of improving ground and apparatus used therefor
    Patent number: 5141366
    Abstract: A method of improving water retention characteristics of soil by using water absorption polymer, including the steps of forming a water impermeable layer in a subsurface layer of the ground, and providing a water absorption polymer layer in an upper region of the water impermeable layer. The method is executed by an apparatus for forming a water impermeable layer in a subsurface layer of the ground, the apparatus also being used to mix water absorption polymer in the soil in an upper region of the water impermeable layer, by an injecting apparatus having a drilling function.
    Type: Grant
    Filed: October 3, 1990
    Date of Patent: August 25, 1992
    Assignee: Nitto Chemical Industry Co., Ltd.
    Inventors: Mitsuji Ishida, Tomohiro Sakurada, Katsuhiko Kurihara, Takashi Miki, Goro Murai
  • Grout impregnation method
    Patent number: 4725169
    Abstract: An improved grout impregnation method which uses an injection tube for contacting and mixing different kinds of materials supplied thereinto separately to prepare a grout and impregnates the grout into the earth through an injecting opening provided at a tip end of the tube.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: February 16, 1988
    Assignees: Nitto Chemical Industry Co., Ltd., Nihon Soil Engineering Co., Ltd., Yamaguchi Kikai Kogyo Co., Ltd., Nihon Sogo-Bosui Co., Ltd.
    Inventors: Shunsuke Tazawa, Kenji Takeuchi, Akiyoshi Horiba, Mitsuji Ishida, Syouichi Kashima, Mineo Murata