Patents by Inventor Ryoichi Naka

Ryoichi Naka 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).

  • Easily-cuttable tunnel segment structure
    Patent number: 7004679
    Abstract: The present invention relates to a novel easily-cuttable tunnel segment structure used for the departure of a shield machine from a main tunnel to a branch tunnel or the return to the main tunnel from the branch tunnel, and provides an easily-cuttable tunnel segment structure 1 constructed by connecting a plurality of easily-cuttable tunnel segment pieces 2 in the longitudinal direction of a tunnel, wherein at least an easily-cuttable area 3 is formed by concrete 7 in which easily-cuttable reinforcement members are arranged, and a join disposed at least in the easily-cuttable area 3 in the longitudinal direction has an easily-cuttable join structure.
    Type: Grant
    Filed: November 21, 2002
    Date of Patent: February 28, 2006
    Assignees: Nippon Steel Corporation, Taisei Corporation, GEOSTR Corporation
    Inventors: Ryoichi Naka, Toshihiko Yoshizumi, Shinichi Nakata, Fumio Kondoh, Seiichi Satoh, Osamu Ishita, Yutaka Fujino, Tukasi Chiba
  • Easily-cuttable tunnel segment structure
    Publication number: 20030113168
    Abstract: The present invention relates to a novel easily-cuttable tunnel segment structure used for the departure of a shield machine from a main tunnel to a branch tunnel or the return to the main tunnel from the branch tunnel, and provides an easily-cuttable tunnel segment structure 1 constructed by connecting a plurality of easily-cuttable tunnel segment pieces 2 in the longitudinal direction of a tunnel, wherein at least an easily-cuttable area 3 is formed by concrete 7 in which easily-cuttable reinforcement members are arranged, and a join disposed at least in the easily-cuttable area 3 in the longitudinal direction has an easily-cuttable join structure.
    Type: Application
    Filed: November 21, 2002
    Publication date: June 19, 2003
    Inventors: Ryoichi Naka, Toshihiko Yoshizumi, Shinichi Nakata, Fumio Kondoh, Seiichi Satoh, Osamu Ishita, Yutaka Fujino, Tukasi Chiba
  • Corrosion resistant Zn-Cr plated steel strip
    Patent number: 4897317
    Abstract: A plated steel strip having an enhanced corrosion and rust resistance and an improved paint-coating property comprises a principal plating layer formed on a steel strip substrate and comprising a co-deposited zinc-chromium based alloy which comprises more than 5% by weight but not more than 40% by weight of chromium and the balance of zinc.
    Type: Grant
    Filed: March 29, 1988
    Date of Patent: January 30, 1990
    Assignee: Nippon Steel Corporation
    Inventors: Tatsuya Kanamaru, Motohiro Nakayama, Katutoshi Arai, Shinichi Suzuki, Ryoichi Naka
  • Corrosion resistant plated steel strip and method for producing same
    Patent number: 4877494
    Abstract: A plated steel strip having an enhanced corrosion and rust resistance and an improved paint-coating property comprises a principal plating layer formed on a steel strip substrate and comprising a co-deposited zinc-chromium based alloy which comprises more than 5% by weight but not more than 40% by weight of chromium and the balance of zinc.
    Type: Grant
    Filed: March 7, 1989
    Date of Patent: October 31, 1989
    Assignee: Nippon Steel Corporation
    Inventors: Tatsuya Kanamaru, Motohiro Nakayama, Katutoshi Arai, Shinichi Suzuki, Ryoichi Naka
  • Process for electrolytically removing metal deposit from a non-plated surface of a single surface-plated metal strip
    Patent number: 4548685
    Abstract: In a process for electrolytically removing metal deposit from a non-plated surface of a single surface-plated metal strip, by bringing, within an electrolytic liquid, a single surface-plated metal strip which serves as an anode plate, into a location at which the non-plated surface of the anode single surface-plated metal strip faces in parallel to and is spaced from a cathode plate, and by applying a principal voltage between the anode metal strip and said cathode plate to electrolytically remove metal deposit from the non-plated surface; whereby undesirable stripping of portions of the plated metal layer in side edge portions of the plated surface of the metal strip is prevented by arranging supplementary anode plates within the electrolytic liquid in such a manner that the supplementary anode plates face in parallel to and are spaced from side edge portions of the plated surface of the anode metal strip, and then, while the principal voltage is applied between the anode metal strip and the cathode plate, a
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: October 22, 1985
    Assignee: Nippon Steel Corporation
    Inventors: Yukimasa Suemitsu, Kazutsugu Nakajima, Ryoichi Naka, Hiroo Goshi