Patents by Inventor Hirofumi TAI

Hirofumi TAI 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).

  • SI-KILLED STEEL WIRE ROD HAVING EXCELLENT FATIGUE PROPERTIES, AND SPRING USING SAME
    Publication number: 20150369322
    Abstract: This Si-killed steel wire rod has Si-killed steel which contains specific chemical components that contain, as 80% or more of the number of inclusions, specific CaO—Al2O3—SiO2 inclusions, wherein the average composition of the MnO—Al2O3—SiO2 inclusions that satisfies the following (3A) satisfies the following (3B). (3A) If CaO+Al2O3+SiO2+MgO+MnO serves as the 100% standard, MnO+Al2O3+SiO2?80%, MnO>CaO. (3B) When CaO+Al2O3+SiO2+MgO+MnO serves as the 100% standard, MnO: 10 to 70%, Al2O3: 3 to 50%, SiO2: 20 to 75%.
    Type: Application
    Filed: January 15, 2014
    Publication date: December 24, 2015
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Tomoko SUGIMURA, Hiroaki SAKAI, Yasumasa YOSHIDA, Hirofumi TAI, Hiroki OHTA, Hiroyuki ONODA