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:
Jul. 14, 2020
Filed:
Sep. 20, 2016
Applicant:
Fujikura Ltd., Tokyo, JP;
Inventors:
Takayuki Kitamura, Chiba, JP;
Akihito Imase, Chiba, JP;
Assignee:
Fujikura Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B 37/025 (2006.01); C03B 37/027 (2006.01); C03B 37/03 (2006.01); G02B 6/02 (2006.01);
U.S. Cl.
CPC ...
C03B 37/0253 (2013.01); C03B 37/02727 (2013.01); C03B 37/032 (2013.01); G02B 6/02 (2013.01);
Abstract
An optical fiber production method includes: drawing an optical fiber from an optical fiber preform in a drawing furnace; cooling the optical fiber in an annealing furnace; and delivering the optical fiber into the annealing furnace, and controlling a temperature difference between a temperature of the optical fiber and a fictive temperature of glass forming a core included in the optical fiber to be higher than 20° C. and lower than 100° C.