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:
Feb. 27, 2018
Filed:
Jun. 24, 2016
Applicant:
Furukawa Electric Co., Ltd., Tokyo, JP;
Inventor:
Seiichi Shinada, Tokyo, JP;
Assignee:
FURUKAWA ELECTRIC CO., LTD., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C03B 37/014 (2006.01);
U.S. Cl.
CPC ...
C03B 37/01446 (2013.01); C03B 37/01453 (2013.01); C03B 2201/12 (2013.01);
Abstract
A production method of an optical fiber preform includes: forming a porous preform by depositing silica particles at an outer periphery of a core rod; and vitrifying the porous preform by conducting thermal treatment steps. At a first thermal treatment step that is an initial thermal treatment step of the thermal treatment steps, the porous preform is heated so that internal temperatures at two end portions in a longitudinal direction of the porous preform increase before an internal temperature of a center portion in the longitudinal direction increases.