Patents Assigned to Japan as Represented by Director General, Technical Research and Development Institute, Japan Defense Agency
  • Gas-generating agent for use in ducted rocket engine
    Patent number: 4925909
    Abstract: A gas-generating agent for use in a ducted rocket engine essentially consists of an aliphatic polyester represented by the formula: ##STR1## or the formula: ##STR2## and a curing agent and optionally incorporating therein additives such as a curing catalyst.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: May 15, 1990
    Assignees: Japan as represented by Director General, Technical Research and Development Institute, Japan Defense Agency, Nippon Oil & Fats Co., Ltd.
    Inventors: Naminosuke Kubota, Haruaki Shimizu, Tadashi Sonobe, Goro Nakashita
  • 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