Patents Assigned to Nippon Silica Industrial Co., Ltd.
  • Apparatus for polishing
    Patent number: 5032203
    Abstract: Polishing agent including as a main constituent an aqueous solution containing sodium bromite. The aqueous solution may further contain particles which are not dissolved in the solution or an alkali agent to adjust the pH to 8 to 14. Also the apparatus and method for polishing articles using the polishing agent are disclosed.
    Type: Grant
    Filed: January 4, 1989
    Date of Patent: July 16, 1991
    Assignees: Nippon Telegraph & Telephone Corp., Nippon Silica Industrial Co., Ltd.
    Inventors: Toshiroh K. Doy, Hiroshi Nakada, Yoshihiko Kunimitsu
  • Stable crystals of sodium bromite trihydrate
    Patent number: 4650658
    Abstract: NaBrO.sub.2.3H.sub.2 O crystals with excellent storage stability which contain at least 30 wt. % of NaBrO.sub.2.3H.sub.2 O and 0.5-5.0 wt. % of NaOH. The crystals are produced by precipitation from NaBrO.sub.2 solutions containing NaOH and impurities and are very useful as oxidizing and brominating agents.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: March 17, 1987
    Assignee: Nippon Silica Industrial Co., Ltd.
    Inventors: Hisao Shiozawa, Kihachiro Matsuda