C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/46
C03B 25/10 (2006.01) C03B 20/00 (2006.01) C03B 29/14 (2006.01) C03B 32/00 (2006.01) C03B 37/012 (2006.01)
Patent
CA 2013730
Abstract: The present invention relates to a heating furnace comprising a furnace body, a cylindrical zone heater in the furnace body, a muffle tube installed through the furnace body for thermally treating a porous preform made of high purity quartz glass. The preform is moved vertically through the muffle tube and a partition unit in the portion of the muffle tube projecting above the furnace body. The interior space of the muffle tube is divided into an upper space and a lower one.
Ishiguro Yoichi
Ishikawa Shinji
Kanamori Hiroo
Saitoh Masahide
Tsuchiya Ichiro
Kirby Eades Gale Baker
Sumitomo Electric Industries Ltd.
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