Patents by Inventor Jyou Tanioka

Jyou Tanioka 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).

  • Martensitic stainless steel having excellent hardness by subzero treatment
    Patent number: 4846904
    Abstract: This invention provides the following stainless steels called invention steel 1 and invention steel 2.Invention steel 1 is a subzero treatment hardening type martensitic stainless steel characterized by comprising not more than 0.4% by weight of C, not more than 0.4% by weight of N, not more than 15% by weight of Mn, not more than 12% by weight of Ni, 10 to 23% by weight of Cr, not more than 3.0% by weight of Mo, not more than 5.0% by weight of Cur, not more than 2.0% by weight of Si, and the remaining portion consisting of inevitable impurities and Fe and satisfying the following formaulae (1), (2) and (3),[Cr %]+1.5[Si %]+[Mo %]-[Mn %)]-1.3[Ni %]-[Cu %]-19 [C %]-19[N %].ltoreq.12.0 Formula (1)27.5.ltoreq.[Cr %]+1.3[SDi %]+1.3[Mn %]+1.5[Ni %]+[Cu %]+[Mo %]+15[C %]+20[N %].ltoreq.32.0 Formula (2)and1.3[Ni %]+[Mn %]+[Cu %]>4.0 Formula (3)Invention steel is a subzero treatment hardening type martensitic stainless characterized by comprising not more than 0.4% by weight of C, not more than 0.
    Type: Grant
    Filed: May 19, 1988
    Date of Patent: July 11, 1989
    Assignee: Nippon Metal Industry Co., Ltd.
    Inventors: Hiroshi Arai, Tadahiko Murakami, Kazuo Mashimo, Jyou Tanioka