Patents by Inventor Koki MINOGUCHI

Koki MINOGUCHI 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).

  • High strength spring, method of manufacturing the same, steel for high strength spring, and method of manufacturing the same
    Patent number: 10752971
    Abstract: A high strength spring containing, by mass %, C: 0.40 to 0.50%, Si: 1.00 to 3.00%, Mn: 0.30 to 1.20%, Ni: 0.05 to 0.50%, Cr: 0.35 to 1.50%, Mo: 0.03 to 0.50%, Cu: 0.05 to 0.50%, Al: 0.005 to 0.100%, V: 0.05 to 0.50%, Nb: 0.005 to 0.150%, N: 0.0100 to 0.0200%, P: limited to be less than or equal to 0.015%, S: limited to be less than or equal to 0.010%, and the balance of Fe and inevitable impurities, wherein a Nb-compound including at least one of Nb-carbide, Nb-nitride and Nb-carbonitride is included, and wherein a V-compound including at least one of V-carbide and V-carbonitride that is precipitated around the Nb-compound is included.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: August 25, 2020
    Assignee: MITSUBISHI STEEL MFG. CO., LTD.
    Inventors: Motoki Watanabe, Koki Minoguchi, Hiroyuki Oishi
  • HIGH STRENGTH SPRING, METHOD OF MANUFACTURING THE SAME, STEEL FOR HIGH STRENGTH SPRING, AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20190032165
    Abstract: A high strength spring containing, by mass %, C: 0.40 to 0.50%, Si: 1.00 to 3.00%, Mn: 0.30 to 1.20%, Ni: 0.05 to 0.50%, Cr: 0.35 to 1.50%, Mo: 0.03 to 0.50%, Cu: 0.05 to 0.50%, Al: 0.005 to 0.100%, V: 0.05 to 0.50%, Nb: 0.005 to 0.150%, N: 0.0100 to 0.0200%, P: limited to be less than or equal to 0.015%, S: limited to be less than or equal to 0.010%, and the balance of Fe and inevitable impurities, wherein a Nb-compound including at least one of Nb-carbide, Nb-nitride and Nb-carbonitride is included, and wherein a V-compound including at least one of V-carbide and V-carbonitride that is precipitated around the Nb-compound is included.
    Type: Application
    Filed: June 1, 2017
    Publication date: January 31, 2019
    Inventors: Motoki WATANABE, Koki MINOGUCHI, Hiroyuki OISHI