Patents by Inventor Kunimitsu Yamada

Kunimitsu Yamada 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).

  • Patent number: 4798499
    Abstract: A concrete revetment is provided which is arcuate in horizontal cross section, and has end portions which are interconnected by a cordal member. The cordal member is adapted to be prestressed by a tension rod to place the cordal member in compressive stress and the arcuate portion of the revetment in tensile stress. The revetment is held in place by anchor means embedded in back-fill on the convex side of the arcuate revetment. A plurality of revetments may be arranged and interlocked horizontally and vertically to form a revetment wall.
    Type: Grant
    Filed: May 15, 1986
    Date of Patent: January 17, 1989
    Assignees: Kensetsukiso Engineering Co., Ltd., Okabe Co., Ltd.
    Inventor: Kunimitsu Yamada
  • Patent number: 4171176
    Abstract: A flexible bar reinforced concrete pile is provided herein composed of a steel tube containing therein a plurality of jointless high-strength flexible bars, strands or bundles of bar or strand located axially along the inside wall of said steel tube, the remaining space within the steel tube being packed with prepacked concrete or mortar, and a method for constructing the same.
    Type: Grant
    Filed: August 25, 1977
    Date of Patent: October 16, 1979
    Assignees: Taisei Corporation, Neturen Co. Ltd.
    Inventor: Kunimitsu Yamada
  • Patent number: 4132498
    Abstract: An anchor removing device is constituted by providing a wedge shaped breaking means tapered in the drawing-out direction, which is temporarily secured to the tip portion of an anchor steel member and a tension steel member encompassed with sheath coupled to the wedge shaped breaking means. After this anchor removing device has been inserted into anchor hole which is bored in the ground, a hardenable filler material is injected into the anchor hole to form an anchor body. The hardenable filler material may produce voids or contains a foreign material of a low rigidity, which produces the effect similar to that of voids, such as air bubbles. The material may be foamable polystyrene and a cork of a given porosity. Typical example of the hardenable filler material is a foamed concrete milk. At the time of removing the anchor, the edge shaped breaking means is withdrawn by pulling the tension steel member with a jack or the like.
    Type: Grant
    Filed: February 14, 1978
    Date of Patent: January 2, 1979
    Assignees: Shigeru Sugimura, Kunimitsu Yamada
    Inventors: Isamu Ikeda, Kunimitsu Yamada
  • Patent number: 4069677
    Abstract: An earth anchor includes a steel tension member, or members, sheath encased and embedded in a hardenable material such as mortar grout poured in a bore hole prepared in the ground. Lubricant is applied to the surfaces of the steel tension members before the members are placed within the interior sheaths. Gripping metal pieces are secured to the end portions of the steel tension members in abutment with a pressure bearing plate or plates, also secured to the end portions of the steel tension members. The gripping metal pieces are designed to be sripped from the steel tension end portion member with a force exceeding the predetermined work load of the steel tension members.
    Type: Grant
    Filed: June 16, 1976
    Date of Patent: January 24, 1978
    Assignee: Kabushiki Kaisha Nitto Tekuno Group
    Inventors: Kunimitsu Yamada, Hitaka Kanematsu