Patents by Inventor Kenzo Tsutaya

Kenzo Tsutaya 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 constructing an enlarged tunnel and apparatus for forming the same
    Patent number: 4618298
    Abstract: A method and apparatus for constructing an enlarged tunnel in a portion of a predetermined region of an existing tunnel. A circumferentially enlarged portion is excavated to define a starting base for a shield machine. The shield machine is positioned in the circumferentially enlarged portion and advanced forward along the existing tunnel in order to enlarge the circumference in the predetermined region of the existing tunnel. A section of a tubular liner lining the existing tunnel is broken and removed therefrom. Thereafter, the resultant enlarged tunnel portion is lined with segments.
    Type: Grant
    Filed: March 30, 1984
    Date of Patent: October 21, 1986
    Assignee: Mitsui Kensetsu Kabushiki Kaisha
    Inventors: Shigeo Takamiya, Kazutoshi Inoue, Kenzo Tsutaya