Patents by Inventor Masakazu Ootsubo

Masakazu Ootsubo 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 material and product thereof containing low-silica electrofused magnesia clinker
    Patent number: 5369066
    Abstract: Disclosed herein are a refractory material of high-purity electrofused magnesia clinker having good resistance to corrosion by slag, especially the slag with a high iron content, at high temperatures under an oxidative environment, and a burned or unburned refractory brick made of such refractory material of high corrosion resistance, which is superior in corrosion resistance as well as spalling resistance.The refractory material comprises more than 10 wt. % of electrofused magnesia clinker containing 98.0 to 99.8 wt. % of MgO, less than 0.05 wt. % of SiO.sub.2, and 0.1 to 2.0 wt. % of CaO. It may be in the form of burned or unburned or prepared unshaped refractories.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: November 29, 1994
    Assignee: Krosaki Corporation
    Inventors: Naoki Furuta, Masakazu Ootsubo, Setsunori Hamaguchi, Isao Watanabe, Yoichi Furuta, Toshihiro Suruga