Patents by Inventor Hiroyuki Shikama

Hiroyuki Shikama 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).

  • Refractory brick
    Patent number: 7939458
    Abstract: A refractory brick having durability equal to alumina-magnesia castable materials, which is especially suitable for a ladle for steel making is provided. A refractory brick prepared by using an alumina raw material and a magnesia raw material containing 90% by mass or more of a fine powder of not more than 0.5 mm, press molding and then heat treating at 100° C. or higher and not higher than 1,150° C., the refractory brick containing Al2O3 and MgO in a total sum of 90% by mass or more, from 4 to 16% by mass of MgO, from 0.5 to 5% by mass of SiO2, and Na2O and K2O in a total sum of from 0.3 to 2% by mass, with the remainder being inevitable impurities and Al2O3.
    Type: Grant
    Filed: November 24, 2006
    Date of Patent: May 10, 2011
    Assignee: Shinagawa Refractories Co., Ltd.
    Inventors: Ryosuke Nakamura, Hiroyuki Shikama, Hisashi Tomiya, Hisaharu Sasaki
  • REFRACTORY BRICK
    Publication number: 20090286668
    Abstract: A refractory brick having durability equal to alumina-magnesia castable materials, which is especially suitable for a ladle for steel making is provided. A refractory brick prepared by using an alumina raw material and a magnesia raw material containing 90% by mass or more of a fine powder of not more than 0.5 mm, press molding and then heat treating at 100° C. or higher and not higher than 1,150° C., the refractory brick containing Al2O3 and MgO in a total sum of 90% by mass or more, from 4 to 16% by mass of MgO, from 0.5 to 5% by mass of SiO2, and Na2O and K2O in a total sum of from 0.3 to 2% by mass, with the remainder being inevitable impurities and Al2O3.
    Type: Application
    Filed: November 24, 2006
    Publication date: November 19, 2009
    Applicant: SHINAGAWA REFRACTORIES CO., LTD.
    Inventors: Ryosuke Nakamura, Hiroyuki Shikama, Hisashi Tomiya, Hisaharu Sasaki