Patents by Inventor Toshiyuki Ohkuma

Toshiyuki Ohkuma 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).

  • Frost damage proofed pile
    Patent number: 4818148
    Abstract: A covering is applied onto the outer surface of a pile including a steel pipe or the like to surround a predetermined length thereof so as to reduce a frost heaving force or negative friction acting on the pile in a frigid area. The covering is closely adhered by an adhesion layer the like to the pile over a given length thereof. This given length is between 0.5 and 5 m. The covering member includes a smooth-surfaced plastic covering or elastic covering. A rugged surface covering may be provided below the smooth surfaced covering.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: April 4, 1989
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Takashi Takeda, Katsumi Omori, Toshiyuki Ohkuma, Kenji Kidera, Shigeru Nakagawa, Tetsuzo Hirose