Patents by Inventor Akiyoshi Tsuji

Akiyoshi Tsuji 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).

  • Steel plate and steel pipe for line pipes
    Patent number: 8801874
    Abstract: A steel plate for line pipes containing, in terms of % by weight, C: 0.02 to 0.06%, Si: 0.5% or less, Mn: 0.8 to 1.6%, P: 0.008% or less, S: 0.0008% or less, Al: 0.08% or less, Nb: 0.005 to 0.035%, Ti: 0.005 to 0.025%, and Ca: 0.0005 to 0.0035%, and optionally contains one or more of Cu: 0.5% or less, Ni: 1% or less, Cr: 0.5% or less, Mo: 0.5% or less and V: 0.1% or less, and has a CP value of 0.95 or less represented by CP=4.46C(%)+2.37Mn(%)/6+{1.18Cr(%)+1.95Mo(%)+1.74V(%)}/5+{1.74Cu(%)+1.7Ni(%)}/15+22.36P(%), and a Ceq value of 0.30 or more represented by Ceq=C(%)+Mn(%)/6+{Cr(%)+Mo(%)+V(%)}/5 +{Cu(%)+Ni(%)}/15.
    Type: Grant
    Filed: November 7, 2008
    Date of Patent: August 12, 2014
    Assignee: JFE Steel Corporation
    Inventors: Nobuyuki Ishikawa, Makoto Suzuki, Tomohiro Matsushima, Akiyoshi Tsuji, Shinichi Kakihara, Nobuo Shikanai, Yutaka Awajiya
  • STEEL PLATE AND STEEL PIPE FOR LINE PIPES
    Publication number: 20100326559
    Abstract: A steel plate for line pipes containing, in terms of % by weight, C: 0.02 to 0.06%, Si: 0.5% or less, Mn: 0.8 to 1.6%, P: 0.008% or less, S: 0.0008% or less, Al: 0.08% or less, Nb: 0.005 to 0.035%, Ti: 0.005 to 0.025%, and Ca: 0.0005 to 0.0035%, and optionally contains one or more of Cu: 0.5% or less, Ni: 1% or less, Cr: 0.5% or less, Mo: 0.5% or less and V: 0.1% or less, and has a CP value of 0.95 or less represented by CP=4.46C(%)+2.37Mn(%)/6+{1.18Cr(%)+1.95Mo(%)+1.74V(%)}/5+{1.74Cu(%)+1.7Ni(%)}/15+22.36P(%), and a Ceq value of 0.30 or more represented by Ceq=C(%)+Mn(%)/6+{Cr(%)+Mo(%)+V(%)}/5+{Cu(%)+Ni(%)}/15.
    Type: Application
    Filed: November 7, 2008
    Publication date: December 30, 2010
    Applicant: JFE STEEL CORPORATION
    Inventors: Nobuyuki Ishikawa, Makoto Suzuki, Tomohiro Matsushima, Akiyoshi Tsuji, Shinichi Kakihara, Nobuo Shikanai, Yutaka Awajiya