Patents by Inventor Tadao Katagiri

Tadao Katagiri 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).

  • Thick-walled high-strength seamless steel pipe with excellent sour resistance for pipe for pipeline, and process for producing same
    Patent number: 9932651
    Abstract: A heavy wall and high strength seamless steel pipe having high sour resistance is provided. In particular, a quenching and tempering treatment is conducted to adjust the yield strength to be higher than 450 MPa and adjust the Vickers hardness HV5 that can be measured at an outermost side or an innermost side of the pipe under a 5 kgf load (test load: 49 N) to be 250 HV5 or less.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: April 3, 2018
    Assignee: JFE Steel Corporation
    Inventors: Yasuhide Ishiguro, Mitsuo Kimura, Kenichiro Eguchi, Hiroshi Yokogawa, Tadao Katagiri, Masahito Tanaka
  • THICK-WALLED HIGH-STRENGTH SEAMLESS STEEL PIPE WITH EXCELLENT SOUR RESISTANCE FOR PIPE FOR PIPELINE, AND PROCESS FOR PRODUCING SAME
    Publication number: 20140137992
    Abstract: A heavy wall and high strength seamless steel pipe having high sour resistance is provided. In particular, a quenching and tempering treatment is conducted to adjust the yield strength to be higher than 450 MPa and adjust the Vickers hardness HV5 that can be measured at an outermost side or an innermost side of the pipe under a 5 kgf load (test load: 49 N) to be 250 HV5 or less.
    Type: Application
    Filed: June 29, 2012
    Publication date: May 22, 2014
    Applicant: JFE Steel Corporation
    Inventors: Yasuhide Ishiguro, Mitsuo Kimura, Kenichiro Eguchi, Hiroshi Yokogawa, Tadao Katagiri, Masahito Tanaka