Patents Examined by J. Lorengo
  • Highly durable silica glass, process and apparatus for producing same, and member and apparatus provided with same
    Patent number: 7064094
    Abstract: Highly durable silica glass containing 0.01% to 2% by weight of at least one element selected from magnesium, calcium, strontium, barium, yttrium, hafnium and zirconium. The silica glass is produced by melting a powdery material comprising a finely divided silica powder and a finely divided zirconium-containing substance by oxyhydrogen flame or plasma are to form an accumulated molten material layer, and extending the molten material layer outwardly in radial directions.
    Type: Grant
    Filed: November 24, 2003
    Date of Patent: June 20, 2006
    Assignees: Tosoh Corporation, Tosoh Quartz Corporation, Tosoh SMG Corporation
    Inventors: Yoshinori Harada, Shuzo Mizutani, Shinkichi Hashimoto, Masakazu Kudoh, Naoki Miura, Katsufumi Takahashi, Hideki Kiyohara