C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
32/23, 117/85
C03B 20/00 (2006.01) C03B 37/014 (2006.01) C03B 37/02 (2006.01) C03C 17/00 (2006.01)
Patent
CA 1179213
ABSTRACT OF THE DISCLOSURE A process for producing an optical fiber preform in a muffle furnace by hydrolyzing a gaseous glass forming material with a flame from an oxyhydrogen burner and deposit- ing the resulting soot in a rod shape and an apparatus therefor are described, wherein a gas is supplied to the muffle furnace other than from said burner, and the volume supply of said gas is held constant by controlling the amount of a control gas supplied into an intermediate portion of all exhaust pipe through which the gases formed in the muffle furnace and the fine glass particles that do not deposit in a rod shape are discharged.
392143
Kuwahara Toru
Miyajiri Tetsuo
Nakahara Motohiro
Yoshioka Naoki
Nippon Telegraph & Telephone Public Corporation
Riches Mckenzie & Herbert Llp
Sumitomo Electric Industries Ltd.
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