Patents by Inventor Yoichiro Tobe

Yoichiro Tobe 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 toughness, ultra-high strength steel having an excellent stress corrosion cracking resistance with a yield stress of not less than 110 kgf/mm.sup.2
    Patent number: 4814141
    Abstract: A high toughness, ultra high-strength steel having an excellent stress corrosion cracking resistance with a yield stress of not less than 110 kgf/mm.sup.2, which comprises 0.06-0.20 wt % of C, not more than 0.35 wt % of Si, 0.05-1.0 wt % of Mn, 8-11 wt % of Ni, 0.2-2.5 wt % of Cr, 0.7-2.5 wt % of Mo, 0.05-0.2 wt % of V, 0.01-0.08 wt % of Al, not more than 0.005 wt % of N, not more than 0.003 wt % of O, provided that the value of Al (%).times.N (%).times.10.sup.4 is not more than 1.5, and the balance being substantially Fe and inevitable impurities.
    Type: Grant
    Filed: April 22, 1987
    Date of Patent: March 21, 1989
    Assignees: Japan as Represented by Director General, Technical Research and Development Institute, Japan Defense Agency, Nippon Steel Corporation, Kawasaki Steel Corporation
    Inventors: Yasuho Imai, Yoichiro Tobe, Ko Moriyama, Seinosuke Yano, Syuzo Ueda, Seimei Karino