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:
Apr. 15, 2003
Filed:
Jul. 03, 1996
Ichiro Tsuchiya, Yokohama, JP;
Kohei Kobayashi, Yokohama, JP;
Hiroaki Ohta, Yokohama, JP;
Kazuya Kuwahara, Yokohama, JP;
Katsuyuki Tsuneishi, Yokohama, JP;
Hideo Miyaki, Yokohama, JP;
Yasuo Matsuda, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
There is provided an optical fiber drawing furnace capable of drawing an optical fiber having small non circularity, which drawing furnace includes a muffle tube, in which an optical fiber preform is supplied, a heater surrounding the muffle tube, a plurality of electrode connecting portion extending from the heater, a plurality of electrodes connected to electrode connecting portions, and in conjunction therewith to an electric power source, and unifying means for unifying the temperature distribution along the circumferential direction.