Stock material or miscellaneous articles – Hollow or container type article – Glass – ceramic – or sintered – fused – fired – or calcined metal...
Patent
1990-02-27
1992-08-25
Robinson, Ellis P.
Stock material or miscellaneous articles
Hollow or container type article
Glass, ceramic, or sintered, fused, fired, or calcined metal...
428 344, 501 12, 501 53, 501 54, 65900, B03C 300
Patent
active
051417863
ABSTRACT:
A synthetic silica glass article made by hydrolyzing an alkoxysilane and thermally sintering the resulting silica; this synthetic silica glass article has a viscosity of not lower than 10.sup.10 poise at 140.degree. C., and contains, as metallic impurities, less than 1 ppm at Al, less than 0.2 ppm of Fe, less than 0.2 ppm of Na, less than 0.2 ppm of K, less than 0.01 ppm of Li, less than 0.2 ppm of Ca, less than 0.02 ppm of Ti, less than 0.01 ppm of B, less than 0.01 of P, less than 0.01 ppm of As.
REFERENCES:
patent: 4747863 (1988-05-01), Clasen
patent: 4789389 (1988-12-01), Schermerhorn
patent: 4826521 (1989-05-01), Weichmann
patent: 4979973 (1990-12-01), Takita
Lon Loss Fused Silica Made by the Plasma Torch by Nassau, Rich, and Shiever Applied Optics, vol. 13, #4, Apr. 1974.
Shimizu Takaaki
Takita Masatoshi
Dye Rena L.
Robinson Ellis P.
Shin-Etsu Chemical Co. , Ltd.
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