Patents by Inventor Takahumi Nishibe

Takahumi Nishibe 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 having high resistance to corrosion and spalling and manufacturing method thereof
    Patent number: 5055433
    Abstract: An alumina-zirconia electrofusing material whose chemical composition consists of about 30-75 wt. % Al.sub.2 O.sub.3 and about 25-70 wt. % ZrO.sub.2 is provided in an amount of about 5-50 wt %, and this electrofusing material is mixed with other materials, and a resultant mixture is press-shaped and fired to produce a slide gate refractory. In order to further improve resistance to corrosion and spalling, particle diameters of the electrofusing material are continuously distributed in a range from about 0.1 mm to about 2.5 mm.
    Type: Grant
    Filed: June 1, 1989
    Date of Patent: October 8, 1991
    Assignee: Toshiba Ceramics Co., Ltd.
    Inventors: Shigeki Niwa, Kazuhide Kawai, Takahumi Nishibe, Toshio Kawamura