Patents by Inventor Kozo Denpo

Kozo Denpo 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).

  • Alloy and composite steel tube with corrosion resistance in combustion environment where V, NA, S and C1 are present
    Patent number: 5194222
    Abstract: An alloy exhibiting corrosion resistance in a combustion environment where V, Na, S and Cl are present comprises, in weight percent, not more than 0.05% C, 0.02-0.5% Si, 0.02-0.5% Mn, 15-35% Cr, 0.5-4% Mo, 10-40% Co, 5-15% Fe, 0.5-5% W, 0.0003-0.005% Ca and the remainder of Ni at a content of not less than 4% and unavoidable impurities, provided that Cr (%)+0.5Ni (%)+3Mo (%).gtoreq.30 (%) and Ni (%)+0.5Co (%).gtoreq.Cr (%)+Mo (%)+W (%). A composite steel tube exhibiting corrosion resistance in a combustion environment where V, Na, S and Cl are present comprises an inner tube constituted of Cr-containing boiler tube and an outer tube constituted of the alloy.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: March 16, 1993
    Assignee: Nippon Steel Corporation
    Inventors: Hiroyuki Ogawa, Tetsuo Ishitsuka, Kozo Denpo, Akihiro Miyasaka, Michihisa Ito, Mizuo Sakakibara
  • Alloy and composite steel tube with corrosion resistance in combustion environment where V, Na, S and Cl are present
    Patent number: 5190832
    Abstract: An alloy exhibiting corrosion resistance in a combustion environment where V, Na, S and Cl are present comprises, in weight percent, not more than 0.05% C, 0.02-0.5% Si, 0.02-0.5% Mn, 15-35% Cr, 0.5-4% Mo, more than 40% but not more than 60% Co, 5-15% Fe, 0.5-5% W, 0.0003-0.005% Ca and the remainder of Ni at a content of not less than 4% and unavoidable impurities, provided that Cr (%)+0.5Ni (%)+3Mo (%).gtoreq.30 (%). A composite steel tube exhibiting corrosion resistance in a combustion environment where V, Na, S and Cl are present comprises an inner tube constituted of Cr-containing boiler tube and an outer tube constituted of the alloy.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: March 2, 1993
    Assignee: Nippon Steel Corporation
    Inventors: Hiroyuki Ogawa, Tetsuo Ishitsuka, Kozo Denpo, Akihiro Miyasaka, Koichi Takeda, Satoshi Araki