Patents by Inventor Shigetsugu Yoshida

Shigetsugu Yoshida 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).

  • Spring produced by a process comprising coiling a hard drawn steel wire excellent in fatigue strength and resistance to setting
    Patent number: 7763123
    Abstract: Disclosed is a hard-drawn spring which exhibits fatigue strength and sag resistance equal or superior to springs produced using an oil-tempered wire. The hard-drawn spring is produced using a steel wire containing 0.5 to 0.7 mass % of C, 1.0 to 1.95 mass % of Si, 0.5 to 1.5 mass % of Mn and 0.5 to 1.5 mass % of Cr, with the balance being Fe and inevitable impurities. In the steel wire, the number of carbides having circle-equivalent diameters of 0.1 ?m or more is 5 particles/100 ?m2 or less.
    Type: Grant
    Filed: July 22, 2009
    Date of Patent: July 27, 2010
    Assignees: Kabushiki Kaisha Kobe Seiko Sho, Suncall Corporation
    Inventors: Sumie Suda, Nobuhiko Ibaraki, Nao Yoshihara, Shigetsugu Yoshida, Koji Harada
  • STEEL WIRE FOR HARD DRAWN SPRING EXCELLENT IN FATIGUE STRENGTH AND RESISTANCE TO SETTLING, AND HARD DRAWN SPRING
    Publication number: 20090283181
    Abstract: Disclosed is a hard-drawn spring which exhibits fatigue strength and sag resistance equal or superior to springs produced using an oil-tempered wire. The hard-drawn spring is produced using a steel wire containing 0.5 to 0.7 mass % of C, 1.0 to 1.95 mass % of Si, 0.5 to 1.5 mass % of Mn and 0.5 to 1.5 mass % of Cr, with the balance being Fe and inevitable impurities. In the steel wire, the number of carbides having circle-equivalent diameters of 0.1 ?m or more is 5 particles/100 ?m2 or less.
    Type: Application
    Filed: July 22, 2009
    Publication date: November 19, 2009
    Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO, SUNCALL Corporation
    Inventors: Sumie SUDA, Nobuhiko Ibaraki, Nao Yoshihara, Shigetsugu Yoshida, Koji Harada
  • Steel wire for hard drawn spring excellent in fatigue strength and resistance to settling, and hard drawn spring and method of making thereof
    Patent number: 7597768
    Abstract: Disclosed is a hard-drawn spring which exhibits fatigue strength and sag resistance equal or superior to springs produced using an oil-tempered wire. The hard-drawn spring is produced using a steel wire containing 0.5 to 0.7 mass % of C, 1.0 to 1.95 mass % of Si, 0.5 to 1.5 mass % of Mn and 0.5 to 1.5 mass % of Cr, with the balance being Fe and inevitable impurities. In the steel wire, the number of carbides having circle-equivalent diameters of 0.1 ?m or more is 5 particles/100 ?m2 or less.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: October 6, 2009
    Assignees: Kabushiki Kaisha Kobe Seiko Sho, Suncall Corporation
    Inventors: Sumie Suda, Nobuhiko Ibaraki, Nao Yoshihara, Shigetsugu Yoshida, Koji Harada
  • Steel wire for hard drawn spring excellent in fatigue strength and resistance to settling, and hard drawn spring
    Publication number: 20050173028
    Abstract: Disclosed is a hard-drawn spring which exhibits fatigue strength and sag resistance equal or superior to springs produced using an oil-tempered wire. The hard-drawn spring is produced using a steel wire containing 0.5 to 0.7 mass % of C, 1.0 to 1.95 mass % of Si, 0.5 to 1.5 mass % of Mn and 0.5 to 1.5 mass % of Cr, with the balance being Fe and inevitable impurities. In the steel wire, the number of carbides having circle-equivalent diameters of 0.1 ?m or more is 5 particles/100 ?m2 or less.
    Type: Application
    Filed: March 26, 2003
    Publication date: August 11, 2005
    Inventors: Sumie Suda, Nobuhiko Ibaraki, Nao Yoshihara, Shigetsugu Yoshida, Koji Harada