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:
Aug. 16, 2005
Filed:
Oct. 11, 2000
Katsuya Nagayama, Yokohama, JP;
Yuichi Ohga, Yokohama, JP;
Kazuya Kuwahara, Yokohama, JP;
Ichiro Tsuchiya, Yokohama, JP;
Katsuya Nagayama, Yokohama, JP;
Yuichi Ohga, Yokohama, JP;
Kazuya Kuwahara, Yokohama, JP;
Ichiro Tsuchiya, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A drawing apparatuscomprises a drawing furnace, a protecting tube, and a resin curing unit. A buffer chamberis disposed between the drawing furnaceand the protecting tube, and has a length Lin the drawing direction of the optical fiber. The buffer chamberis constituted by a first buffer celland a second buffer cell. In the space within the buffer chamber, an He gas, which is an atmosphere gas within the drawing furnace, and the air, which is an atmosphere gas within the protecting tube, exist in a mixed state. The optical fiberdrawn upon heating in the drawing furnaceis fed to the protecting tube, and a predetermined part of the optical fiberis annealed at a predetermined cooling rate. Thereafter, a coating diecoats the optical fiberwith a UV resin solution, and the resin curing unitcures the UV resin, whereby a coated optical fiberis obtained.