Patents by Inventor Yuji Shoji

Yuji Shoji 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 temperature oxidation resistant austenitic steel
    Patent number: 4530720
    Abstract: The present invention relates to the austenitic steel having improved resistance to oxidation at the high temperature, comprising not more than 0.10% C, 0.1-5.0% Si, not more than 3% Mn, 7-45% Ni, 15-30% Cr and sulfur content being restricted to not more than 0.003%. According to the present invention, by limiting the sulfur content in the austenitic steel to not more than 0.003%, preferably to not more than 0.0015%, the heat-resisting steel material which can show improved resistance to oxidation under severe conditions including repeated heating to high temperatures and cooling to room temperature is provided.
    Type: Grant
    Filed: November 21, 1983
    Date of Patent: July 23, 1985
    Assignees: Sumitomo Metal Industries, Ltd., Nippon Stainless Steel Co., Ltd.
    Inventors: Taishi Moroishi, Hisao Fujikawa, Junichiro Murayama, Yuji Shoji
  • Ferritic stainless steel having improved weldability and oxidation resistance
    Patent number: 4140526
    Abstract: A ferritic stainless steel having improved weldability and oxidation resistance, consisting essentially of 11.0 - 20.0% by weight of Cr, less than 0.10% by weight of C, less than 1.5% by weight of Si, less than 1.5% by weight of Mn, less than 1.5% by weight of Zr, the ratio of (Zr%)/(C% + N%) being higher than 7, and the balance of Fe, and the nitrogen amount being restricted to less than 0.015% by weight.
    Type: Grant
    Filed: November 7, 1977
    Date of Patent: February 20, 1979
    Assignees: Sumitomo Metal Industries, Ltd., Nippon Stainless Steel Co., Ltd.
    Inventors: Taishi Moroishi, Isamu Koizumi, Hisao Fujikawa, Hirofumi Makiura, Yuji Shoji