Patents by Inventor Shigeru Omiya

Shigeru Omiya 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).

  • Method of refining of high purity steel
    Patent number: 5304231
    Abstract: Disclosed is a method of refining of a high purity steel capable of effectively lowering impurities in molten steel into respective ultra-low ranges. In secondary refining for molten steel after a molten iron prerefining process and a converting process, a reducing agent and a flux are added on the bath surface within a ladle containing the molten steel decarburized in a converter so that the composition of slag on the bath surface is adjusted in such a manner that the total concentration of FeO and MnO becomes 5 wt % or less, and subsequently, impurities in the molten steel are effectively lowered into respective ultra-low ranges using a RH vacuum degassing unit.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: April 19, 1994
    Assignee: Kawasaki Steel Corporation
    Inventors: Yoshiei Kato, Tadasu Kirihara, Seiji Taguchi, Tetsuya Fujii, Shigeru Omiya, Masahito Suito