Patents by Inventor Hidenori Shirasawa

Hidenori Shirasawa 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 steel pipe for reinforcing door of car
    Patent number: 5180204
    Abstract: Herein described is a high strength steel pipe for reinforcing doors of a car, comprising a steel pipe made by seam-welding a steel sheet, wherein a ratio (Hv.sub.1 /Hv.sub.2) of a minimum hardness in a softened area of a weld affected zone to an average hardness in a base material satisfies the following formula,-0.001.sigma.B+1.05.gtoreq.Hv.sub.1 /Hv.sub.2 .gtoreq.-0.003.sigma.B+1.05wherein.sigma.B: tensile strength (kgf/mm.sup.2) andHv.sub.1, Hv.sub.2 : Vickers hardnessand a ratio (.sigma.y/.sigma.B) of a yield strength .sigma.y to a tensile strength .sigma.B of a steel pipe is 0.7 or more.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: January 19, 1993
    Assignees: Kabushiki Kaisha Kobe Seiko Sho, Sango Co.
    Inventors: Hidenori Shirasawa, Yoshiki Tanaka, Shinji Sawaki
  • Super mild steel having excellent workability and non-aging properties
    Patent number: 4127427
    Abstract: The present invention relates to a super mild steel (a very low yield point steel) having excellent workability and nonaging properties, which consists of in weight percent up to 0.07% C, up to 0.5% Si, up to 0.5% Mn, of 0.005 to 0.1% Al and up to 0.22% [C+1/5(Si+Mn)], and 0.1 to 1.3% Cr when Cr is only added or 0.1 to 1.3% Cr and 0.015 to 0.15% Zr when Cr and Zr are simultaneously added, the balance being iron and inevitable impurities.
    Type: Grant
    Filed: August 16, 1976
    Date of Patent: November 28, 1978
    Assignee: Kobe Steel, Ltd.
    Inventors: Hiroshi Hirano, Hiroshi Kobayashi, Jiro Jizaimaru, Hidenori Shirasawa