Patents by Inventor Tadamasa Yajima

Tadamasa Yajima 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 refining molten steel containing chromium
    Patent number: 4272287
    Abstract: A chromium-containing steel refining process which is employed in a decarburizing refining of chromium-containing steel includes a step of blowing oxygen and inert gas below the upper surface level of molten steel for performing decarburizing reaction there, and a step of blowing oxygen-containing gas above the upper surface level of the molten steel, for the purpose of burning carbon monoxide gas produced from the upper surface of the molten steel, which oxygen-containing gas includes therein oxygen at least 0.2 times as much as the amount of the oxygen blown below the upper surface level of the molten steel.
    Type: Grant
    Filed: May 8, 1980
    Date of Patent: June 9, 1981
    Assignee: Daido Tokushuko Kabushiki Kaisha
    Inventors: Tadamasa Yajima, Shuzo Kitagawa, Hiromi Hata