The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 2005
Filed:
Aug. 31, 2001
Takashi Yamazaki, Kanagawa, JP;
Takashi Kogo, Kanagawa, JP;
Yuichi Ohga, Kanagawa, JP;
Tadashi Enomoto, Kanagawa, JP;
Takashi Yamazaki, Kanagawa, JP;
Takashi Kogo, Kanagawa, JP;
Yuichi Ohga, Kanagawa, JP;
Tadashi Enomoto, Kanagawa, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
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 tubeand second muffle tube. The second muffle tubeis arranged coaxially around the first muffle tube. An optical fiber preform is arranged in this furnace. During the dehydration and consolidation process the pressure of the intermediate roomis 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 roomare performed independent of the gas supply and exhaust of the first muffle tube and a furnace body room.