Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Reexamination Certificate
2005-01-25
2005-01-25
Chin, Peter (Department: 1731)
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
C065S427000, C065S424000, C065S356000, C065S374150, C065S900000
Reexamination Certificate
active
06845636
ABSTRACT:
A dehydration and consolidation furnace and a dehydration and consolidation method in which gas in a chamber does not leak to a furnace body room and gas in a furnace body room does not leak into a chamber is provided. A furnace of one embodiment of this invention has first muffle tube3and second muffle tube4. The second muffle tube4is arranged coaxially around the first muffle tube3. An optical fiber preform is arranged in this furnace. During the dehydration and consolidation process the pressure of the intermediate room10is set lower than a pressure inside the first muffle tube and outside the second muffle tube, and a gas supply and exhaust of the intermediate room10are performed independent of the gas supply and exhaust of the first muffle tube and a furnace body room.
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Enomoto Tadashi
Kogo Takashi
Ohga Yuichi
Yamazaki Takashi
Chin Peter
Hug Eric
Sumitomo Electric Industries Ltd.
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