Patents by Inventor Chikara MATSUZAWA

Chikara MATSUZAWA 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).

  • Manufacturing method of mechanical component using martensitic stainless steel, rotating device, rolling bearing and rolling bearing unit
    Patent number: 10851433
    Abstract: A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%?C+N?0.4% and a PI value (=Cr+3.3Mo+16N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 ?m to 100 ?m and a surface hardness of 58 HRc to 62 HRc.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: December 1, 2020
    Assignee: NSK LTD.
    Inventors: Chikara Matsuzawa, Takafumi Yasuhara, Hiroshi Nishizawa, Norihiro Aoki, Koji Takano, Masaru Kuge
  • Manufacturing method of mechanical component using martensitic stainless steel, rotating device, rolling bearing and rolling bearing unit
    Patent number: 10494692
    Abstract: A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%?C+N?0.4% and a PI value (=Cr+3.3Mo+16N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 ?m to 100 ?m and a surface hardness of 58 HRc to 62 HRc.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: December 3, 2019
    Assignee: NSK LTD.
    Inventors: Chikara Matsuzawa, Takafumi Yasuhara, Hiroshi Nishizawa, Norihiro Aoki, Koji Takano, Masaru Kuge
  • MANUFACTURING METHOD OF MECHANICAL COMPONENT USING MARTENSITIC STAINLESS STEEL, ROTATING DEVICE, ROLLING BEARING AND ROLLING BEARING UNIT
    Publication number: 20190112686
    Abstract: A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%?C+N?0.4% and a PI value (=Cr+3.3 Mo+16 N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 ?m to 100 ?m and a surface hardness of 58 HRc to 62 HRc.
    Type: Application
    Filed: December 13, 2018
    Publication date: April 18, 2019
    Applicant: NSK LTD.
    Inventors: Chikara MATSUZAWA, Takafumi YASUHARA, Hiroshi NISHIZAWA, Norihiro AOKI, Koji TAKANO, Masaru KUGE
  • MANUFACTURING METHOD OF MECHANICAL COMPONENT USING MARTENSITIC STAINLESS STEEL, ROTATING DEVICE, ROLLING BEARING AND ROLLING BEARING UNIT
    Publication number: 20160289785
    Abstract: A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%?C+N?0.4% and a PI value (=Cr+3.3Mo+16N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 ?m to 100 ?m and a surface hardness of 58 HRc to 62 HRc.
    Type: Application
    Filed: November 13, 2014
    Publication date: October 6, 2016
    Applicant: NSK LTD.
    Inventors: Chikara MATSUZAWA, Takafumi YASUHARA, Hiroshi NISHIZAWA, Norihiro AOKI, Koji TAKANO, Masaru KUGE