Patents by Inventor Morihiro Sumida

Morihiro Sumida 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).

  • Steelmaking process with separate refining steps
    Patent number: 4457778
    Abstract: The present invention relates to a steelmaking process, in which the molten pig iron produced in a blast furnace is desiliconized, dephosphorized, decarburized and desulfurized. The characteristic of this invention is a sequence and combination of the refining steps. Namely, the steelmaking process of this invention has individual separate refining steps for realizing a removal reaction of the impurities. The objective reaction is the desiliconization in the first step, the dephosphorization in the second step, the decarburization in the third step and the desulfurization in the fourth step.
    Type: Grant
    Filed: June 14, 1983
    Date of Patent: July 3, 1984
    Assignee: Nippon Steel Corporation
    Inventors: Hiroyuki Nakashima, Morihiro Sumida, Hiroki Goto
  • Steelmaking process with separate refining steps
    Patent number: 4411696
    Abstract: The present invention relates to a steelmaking process, in which the molten pig iron produced in a blast furnace is desiliconized, dephosphorized, decarburized and desulfurized. The characteristic of this invention is a sequence and combination of the refining steps. Namely, the steelmaking process of this invention has individual separate refining steps for realizing a removal reaction of the impurities. The objective reaction is the desiliconization in the first step, the dephosphorization in the second step, the decarburization in the third step and the desulfurization in the fourth step.
    Type: Grant
    Filed: March 29, 1982
    Date of Patent: October 25, 1983
    Assignee: Nippon Steel Corporation
    Inventors: Hiroyuki Nakashima, Morihiro Sumida, Hiroki Goto
  • Steelmaking process with separate refining steps
    Patent number: 4388112
    Abstract: The present invention relates to a steelmaking process, in which the molten pig iron produced in a blast furnace is desiliconized, dephosphorized, decarburized and desulfurized. The characteristic of this invention is a sequence and combination of the refining steps. Namely, the steelmaking process of this invention has individual separate refining steps for realizing a removal reaction of the impurities. The objective reaction is the desiliconization in the first step, the dephosphorization in the second step, the decarburization in the third step and the desulfurization in the fourth step.
    Type: Grant
    Filed: March 13, 1981
    Date of Patent: June 14, 1983
    Assignee: Nippon Steel Corporation
    Inventors: Hiroyuki Nakashima, Morihiro Sumida, Hiroki Goto