Patents by Inventor Shunichiro Akiyama

Shunichiro Akiyama 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).

  • Patent number: 5160389
    Abstract: A flexible tube for the exhaust system of an automobile made from a stainless steel is disclosed, which consists essentially of, by weight %:______________________________________ C: at most 0.03%, Si: 0.1-2.0%, Mn: at most 2.0%, Cr: 18-26%, Ni: 16-30%, Mo: 1.0-3.0%, Ti: 0-0.25%, Nb: 0-1.5%, and ______________________________________a remainder of Fe and incidental impurities, of the impurities, the amount of oxygen being .ltoreq.50 ppm, the amount of S being .ltoreq.20 ppm, and the amount of P being .ltoreq.150 ppm, and the amounts of O, S, and P satisfying the formula1350>25X Oxygen+20XS+P (ppm).
    Type: Grant
    Filed: July 19, 1991
    Date of Patent: November 3, 1992
    Assignees: Nippon Stainless Steel Co., Ltd., Sumitomo Metal Industries, Ltd.
    Inventors: Shunichiro Akiyama, Hisao Fujikawa
  • Patent number: 4950873
    Abstract: A corrosion-resistant steel tube such as a sheath heater steel tube and boiler tube which exhibit improved resistance to dry corrosion under high temperature dry-corrosive conditions in the presence of chlorides is disclosed. The steel consists essentially of, in % by weight:______________________________________ C: not more than 0.05%, Si: 0.1-2.0%, Mn: not more than 2.0%, Cr: 18-26%, Ni: 16-30%, ______________________________________at least one of Mo: 0.5-4.0%, W: 0.01-4.00%, andV: 0.01-4.00%,N: 0-0.25%,(Ti+Nb): 0-1.5%, andthe balance iron and incidental impurities.
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: August 21, 1990
    Assignees: Sumitomo Metal Industries, Ltd., Nippon Stainless Steel Co., Ltd.
    Inventors: Yoshiaki Shida, Hisao Fujikawa, Nobuyuki Maruyama, Shunichiro Akiyama
  • Patent number: 4742324
    Abstract: A corrosion-resistant steel tube such as a sheath heater steel tube and boiler tube which exhibit improved resistance to dry corrosion under high temperature dry-corrosive conditions in the presence of chlorides is disclosed. The steel consists essentially of, in % by weight:C: not more than 0.05%,Si: 0.1-2.0%, Mn: not more than 2.0%,Cr: 18-26%, Ni: 16-30%,at least one of Mo: 0.5-4.0%, W: 0.01-4.00%, andV: 0.01-4.00%,N: 0-0.25%,(Ti+Nb): 0-1.5%, andthe balance iron and incidental impurities.
    Type: Grant
    Filed: May 20, 1987
    Date of Patent: May 3, 1988
    Assignees: Sumitomo Metal Industries Ltd., Nippon Stainless Steel Co., Ltd.
    Inventors: Yoshiaki Shida, Hisao Fujikawa, Nobuyuki Maruyama, Shunichiro Akiyama
  • Patent number: 4484956
    Abstract: A process for producing heat-resistant ferritic stainless steel sheet which exhibits improved toughness and productivity is disclosed. The process comprises the following steps:(a) hot rolling a steel with a finishing temperature of not higher than 850.degree. C., said steel comprising, by weight %,C: not more than 0.07%,Si: 1.5-3.5%,Mn: not more than 2.0%,Cr: 10-25% ,N: not more than 0.05%,Nb: 5X(C %+N %)-20X(C %+N %),optionally at least one element selected from the group consisting of Al, Y, Ca, and REM in a total amount of 0.3% or less, andthe balance iron and incidental impurities; and(b) annealing the resulting hot rolled steel sheet at a temperature of 820.degree.-1000.degree. C.Cold rolling may be applied to the annealed hot-rolled steel sheet.
    Type: Grant
    Filed: February 22, 1984
    Date of Patent: November 27, 1984
    Assignees: Sumitomo Metal Industries, Ltd., Nippon Stainless Steel Co., Ltd.
    Inventors: Yoshiaki Shida, Hisao Fujikawa, Masao Koike, Junichiro Murayama, Shunichiro Akiyama