Patents by Inventor Yotaro Oono

Yotaro Oono 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 operating a blast furnace
    Patent number: 4917727
    Abstract: According to a method of operating a blast furnace, pure oxygen, pulverized coal, and a temperature control gas which substantially does not contain nitrogen are blown from tuyeres. A preheating gas which substantially does not contain nitrogen is blown from an intermediate shaft level. A blast furnace gas which substantially does not contain nitrogen can be produced from a furnace top.
    Type: Grant
    Filed: November 22, 1988
    Date of Patent: April 17, 1990
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Hiroshi Saito, Yotaro Oono, Hirohisa Hotta, Masahiro Matsuura
  • Method for operating a blast furnance by blowing pulverized coal
    Patent number: 4844737
    Abstract: A method for operating a blast furnace, comprising the steps: charging iron ores and cokes through a furnace top into the blast furnace; blowing in gas containing 40 vol. % or more oxygen together with pulverized coal through tuyeres into the blast furnance; and controlling a fuel ratio within a range of 500 to 930 kg/ton., molten pig iron and still a ratio of the pulverized coal blown in through the tuyeres within a range satisfying the formula: ##EQU1## molten pig iron, where X represents a fuel ratio. Through blown-in inlets set in the furnace shaft, preheating gas is blown in to preheat burdens. The cokes charged into the blast furnace are cokes of low strength having a drum index of DI.sub.15.sup.30 of 80 to 90% .
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: July 4, 1989
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Yotaro Oono, Hiroshi Saito, Takehiko Miyamoto, Kazumasa Wakimoto, Hitoshi Kawada, Masahiro Matsuura