Patents Assigned to Kimmon Manufacturing Co., Ltd. and Mitsubishi Chemical Corporation
  • Process for producing synthetic quartz glass powder
    Patent number: 5516350
    Abstract: Synthetic quartz glass powder is produced by (a) hydrolyzing an alkoxysilane to form a gel, (b) finely dividing the gel and then drying, or drying the gel and then finely dividing, and (c) calcining the obtained powder, the powder being maintained under an atmosphere with an oxygen concentration of not less than 30 vol % during at least a part of the calcining period at a temperature of not lower than 1,000.degree. C.
    Type: Grant
    Filed: June 14, 1994
    Date of Patent: May 14, 1996
    Assignee: Kimmon Manufacturing Co., Ltd. and Mitsubishi Chemical Corporation
    Inventors: Hajime Onoda, Hiroshi Ota, Kazumi Kimura, Akira Utsunomiya, Masaru Shimoyama