C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
26/197
C03B 19/00 (2006.01) B07B 7/02 (2006.01) B07B 7/04 (2006.01) B07B 9/02 (2006.01) B07B 11/04 (2006.01) C03B 37/018 (2006.01)
Patent
CA 1193425
- 13 - METHODS AND APPARATUS FOR FABRICATING A LIGHTGUIDE PREFORM Abstract Undeposited reactants passing through a glass substrate tube, during the fabrication of a lightguide preform by the Modified Chemical Vapor Deposition (MCVD) process, flow into a reactant exhaust system and are carried therethrough by a uniformly flowing reactant-free gas. The reactants pass through an exhaust tube, a reactant collection chamber, through a pressure control apparatus and into a gas scrubber. The pressure within the exhaust system is maintained substantially constant during the MCVD process by continously monitoring the pressure therein and adjusting the pressure control apparatus accordingly. Additionally, a continous, uniform flow of reactant-free gas is directed into the exhaust system to assist in the removal of the undeposited reactants therefrom.
412409
Jang Sei-Joo
Pohl Knut D.
Saifi Mansoor A.
Kirby Eades Gale Baker
Western Electric Company Incorporated
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