Patents by Inventor Katsumi Tani

Katsumi Tani 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).

  • Polishing composition
    Patent number: 6193790
    Abstract: A polishing composition for memory hard disks, which comprises water and at least one abrasive selected from the group consisting of aluminum oxide, silicon dioxide, cerium oxide, zirconium oxide, titanium oxide, silicon nitride and manganese dioxide, and which further contains succinic acid or its salt dissolved in the composition.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: February 27, 2001
    Assignee: Fujimi Incorporated
    Inventor: Katsumi Tani
  • Polishing composition and rinsing composition
    Patent number: 6117220
    Abstract: A polishing composition for a memory hard disc, which comprises the following components (a) to (d):(a) water,(b) at least one compound selected from the group consisting of a polystyrenesulfonic acid, and its salts,(c) a compound selected from the group consisting of an inorganic acid and an organic acid, and their salts, other than component (b), and(d) at least one abrasive selected from the group consisting of aluminum oxide, silicon dioxide, cerium oxide, zirconium oxide, titanium oxide, silicon nitride and manganese dioxide.
    Type: Grant
    Filed: November 16, 1999
    Date of Patent: September 12, 2000
    Assignees: Fujimi Incorporated, Toho Chemical Industry Co., Ltd.
    Inventors: Hitoshi Kodama, Toshiki Owaki, Katsumi Tani, Noritaka Yokomichi, Takashi Tokuue, Norio Fujioka, Tetsuya Sayama