Patents Assigned to Japan Abrasive Co., Ltd. (Nihon Kenmazai Kogyo Kabushiki Kaisha)
  • Method for producing mono-crystalline alumina grains
    Patent number: 5273619
    Abstract: Method for producing mono-crystalline alumina grains comprising fusing alna materials in the presence of halide to induce oxyhalide phase at grain boundaries, cooling and solidifying fused materials and separating oxyhalide phase by means of inorganic acid or alkali before or after crushing, and said alumina materials are composed of either aluminum oxides alone or aluminum oxides and at least one of the metallic oxides selected from the group consisting of chromium oxide, titanium oxide and vanadium oxide.
    Type: Grant
    Filed: April 27, 1992
    Date of Patent: December 28, 1993
    Assignee: Japan Abrasive Co., Ltd. (Nihon Kenmazai Kogyo Kabushiki Kaisha)
    Inventors: Tamamaki Masahiro, Onoda Yoshihiro, Nozaki Masaru