Patents by Inventor Ryuichi Asaho

Ryuichi Asaho 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).

  • Process for vacuum degassing and decarbonization with temperature drop compensating feature
    Patent number: 4979983
    Abstract: A process of degassing and decarbonizing is directed to a process for performing vacuum degassing non-deoxidized or slightly deoxidized molten steel utilizing RH process or DH process. The process includes blowing of oxygen or oxygen containing gas toward the surface of the molten steel in a vacuum chamber for promoting decarbonizing reaction. The process further includes a step of combustioning of CO gas in the vicinity of the surface of the molten metal at a timing, in which concentration of (CO+CO.sub.2) in an exhaust gas is higher than or equal to 5% and a ratio of CO.sub.2 versus (CO+CO.sub.2) in the exhaust gas is approximately 30%. Heat generated by combustioning of CO gas is utilized for compensating temperature drop of the molten steel.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: December 25, 1990
    Assignee: Kawasaki Steel Corporation
    Inventors: Hiroshi Nishikawa, Kyoichi Kameyama, Ryuichi Asaho
  • Bottom tuyeres in an oxygen top-blown converter
    Patent number: 4353533
    Abstract: A tuyere for blowing an agitating gas into molten steel is arranged in the bottom of an oxygen top-blown converter in order to improve the refining effect of molten steel and has a ratio of blow sectional area S (cm.sup.2) to inner peripheral length L (cm) of not more than 0.17, preferably not more than 0.125.
    Type: Grant
    Filed: February 17, 1981
    Date of Patent: October 12, 1982
    Assignee: Kawasaki Steel Corporation
    Inventors: Tatsukichi Chino, Takuo Imai, Masaaki Tsukamoto, Ryuichi Asaho, Nagayasu Bessho, Kyoji Nakanishi