Patents by Inventor Masahiko Doe

Masahiko Doe 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).

  • Case hardened steel having reduced thermal treatment distortion
    Patent number: 9422613
    Abstract: This case hardened steel has a composition including, in mass %: C: 0.05 to 0.45%; Si: 0.01 to 1.0%; Mn: over 0 to 2.0%; Al: 0.001 to 0.06%, N: 0.002 to 0.03%, S: over 0 to 0.1%, P: over 0 to 0.05%; and balance: Fe and inevitable impurities. Equation (1) described below and Equation (2) described below are satisfied in equiaxed zone, or Equation (3) described below is satisfied in columnar zone. Re=(Ae/Ao)×100?30%??Equation (1) (Cmin, 1/Co)?0.95??Equation (2) (Cmin, 2/Co)?0.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: August 23, 2016
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kohichi Isobe, Masahiko Doe
  • CASE HARDENED STEEL HAVING REDUCED THERMAL TREATMENT DISTORTION
    Publication number: 20140373978
    Abstract: This case hardened steel has a composition including, in mass %: C: 0.05 to 0.45%; Si: 0.01 to 1.0%; Mn: over 0 to 2.0%; Al: 0.001 to 0.06%, N: 0.002 to 0.03%, S: over 0 to 0.1%, P: over 0 to 0.05%; and balance: Fe and inevitable impurities. Equation (1) described below and Equation (2) described below are satisfied in equiaxed zone, or Equation (3) described below is satisfied in columnar zone. Re=(Ae/Ao)×100?30%??Equation (1) (Cmin,1/Co)?0.95??Equation (2) (Cmin,2/Co)?0.
    Type: Application
    Filed: October 29, 2012
    Publication date: December 25, 2014
    Inventors: Kohichi Isobe, Masahiko Doe