Method of producing glass preform in furnace for heating glass

Details Method of producing glass preform in furnace for heating glass Method of producing glass preform in furnace for heating glass

1992-06-01

1993-11-09

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65DIG16, 65900, C03B 37014

Patent

active

052598560

ABSTRACT:
A heating furnace for heating a porous preform made of fine particles of quartz base glass for an optical fiber which comprises a heater and a muffle tube positioned inside the heater to separate a heating atmosphere from the heater, wherein the muffle tube body consists of highly pure carbon and an inner wall and an outer wall of the body is coated with a carbon material selected from the group consisting of pyrolytic graphite and solid-phase carbonized glassy carbon.

REFERENCES:
patent: 4539033 (1985-09-01), Beales et al.
patent: 4707174 (1987-11-01), Johnson et al.
patent: 4822399 (1989-04-01), Kanamori et al.
patent: 4882827 (1989-11-01), Kusumi et al.
patent: 4969941 (1990-11-01), Kyoto et al.
patent: 4979971 (1990-12-01), Kyoto et al.
patent: 5106401 (1992-04-01), Ishikawa et al.
Ryozo Yamauchi, "Production of Optical Fiber Perform", The Patent Abstract of Japan, Apr. 1989, vol. 13, No. 158, (C-586) (3506).

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