Patents Assigned to Fujimi Kanmazai Kogyo Kabushiki Kaisha of Japan
  • Process for polishing surface of memory hard disc
    Patent number: 4769046
    Abstract: A composition for polishing a layer of non-electrolysis nickel plating, an alumite layer or an aluminium substrate in a memory hard disc, the composition comprising water, a polishing agent of aluminium oxide, and a polishing accelerator of one of nickel nitrate and aluminium nitrate, or two compounds, nickel nitrate and aluminium nitrate, or two compounds, nickel sulfate and aluminium nitrate.
    Type: Grant
    Filed: August 5, 1987
    Date of Patent: September 6, 1988
    Assignee: Fujimi Kanmazai Kogyo Kabushiki Kaisha of Japan
    Inventors: Tetsuji Senda, Takashi Baba