Patents by Inventor Yoshimichi Ohkita

Yoshimichi Ohkita 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).

  • Production of ultra-low phosphorus steel
    Patent number: 4456477
    Abstract: A process for producing an ultra-low phosphorus steel containing 0.010% or less of phosphorus is disclosed, which comprises charging a desiliconized pig iron into a top- and bottom-blowing oxygen converter, introducing a slag-forming agent in a powdered form onto the molten iron together with the top-blowing oxygen and introducing a bottom-blowing gas selected from the group consisting of an inert gas, nitrogen gas, oxygen gas, carbon monoxide gas, carbon dioxide gas and mixtures thereof during the oxygen top-blowing or during both the oxygen top-blowing and the subsequent tapping.
    Type: Grant
    Filed: May 27, 1983
    Date of Patent: June 26, 1984
    Assignee: Sumitomo Metal Industries, Inc.
    Inventors: Seiichi Masuda, Tohru Matsuo, Yoshimichi Ohkita, Takeo Aoki, Hidemasa Nakajima, Shozo Okamura, Takeyuki Hirata, Shoji Anezaki