Patents by Inventor Keizo Taoka

Keizo Taoka 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 for producing chromium containing molten iron with low sulphur concentration
    Patent number: 5028388
    Abstract: Reduction of chromium oxide is performed by utilizing refinement or reduction container having top-blowing capability. Chromium oxide is charged in the molten iron bath in the aforementioned container. Content of slag is adjusted to maintain the following condition:CaO/SiO.sub.2 :2.1 to 3.5MgO/Al.sub.2 O.sub.3 :0.6 to 0.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: July 2, 1991
    Assignee: Kawasaki Steel Corporation
    Inventors: Chikashi Tada, Keizo Taoka, Sumio Yamada, Hajime Bada
  • Process for producing chromium containing molten iron
    Patent number: 4919713
    Abstract: A process of production of chromium containing molten iron generally comprises two steps. In a first step, top and bottom-blown reduction for reducing chromium is performed with charging carbon containing material and slag forming agent from the top of a converter for melting stainless scrap and for rising temperature of molten iron bath. In a second step which is performed subsequently to the first step, top and bottom-blown injection with charging chromium oxide and carbon from the top of the converter for reduction of chromium.
    Type: Grant
    Filed: February 23, 1989
    Date of Patent: April 24, 1990
    Assignee: Kawasaki Steel Corp.
    Inventors: Sumio Yamada, Chikashi Tada, Keizo Taoka, Hajime Bada