Patents by Inventor Yoshihiro Kada

Yoshihiro Kada 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-hardness prehardened steel for cold working with excellent machinability, die made of the same for cold working, and method of working the same
    Patent number: 6663726
    Abstract: There are provided a high-hardness prehardened steel for cold working having excellent machinability containing, by mass, not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, and 0.08 to 0.25% S, a die for cold working which is fabricated by cutting this prehardened steel at a cutting speed not less than 50 m/min. This steel is hardened and tempered to have a hardness not less than 50 HRC. Preferably, this steel consists, by mass, not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, 0.1 to 2.0% Mn, 0.08 to 0.25% S, 0.5 to 15.0% Cr, at least one selected from the group consisting of W and Mo an amount of which one is not more than 3.5% in total in terms of (Mo+1/2W), not more than 4.0% V, not more than 0.15% N, and the balance Fe and incidental impurities.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: December 16, 2003
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yukio Abe, Hideshi Nakatsu, Yasushi Tamura, Yoshihiro Kada
  • High-hardness prehardened steel for cold working with excellent machinability, die made of the same for cold working, and method of working the same
    Publication number: 20020112786
    Abstract: There are provided a high-hardness prehardened steel for cold working having excellent machinability containing, by mass, not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, and 0.08 to 0.25% S, a die for cold working which is fabricated by cutting this prehardened steel at a cutting speed not less than 50 m/min. This steel is hardened and tempered to have a hardness not less than 50 HRC. Preferably, this steel consists, by mass, not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, 0.1 to 2.0% Mn, 0.08 to 0.25% S, 0.5 to 15.0% Cr, at least one selected from the group consisting of W and Mo an amount of which one is not more than 3.5% in total in terms of (Mo+1/2W), not more than 4.0% V, not more than 0.15% N, and the balance Fe and incidental impurities.
    Type: Application
    Filed: December 12, 2001
    Publication date: August 22, 2002
    Applicant: HITACHI METALS, LTD.
    Inventors: Yukio Abe, Hideshi Nakatsu, Yasushi Tamura, Yoshihiro Kada