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:
May. 11, 2021
Filed:
Dec. 11, 2017
Applicant:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Inventors:
Akiko Funakoshi, Yokohama, JP;
Satoshi Tanaka, Yokohama, JP;
Assignee:
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/02 (2006.01); C03B 37/012 (2006.01);
U.S. Cl.
CPC ...
G02B 6/02 (2013.01); C03B 37/01211 (2013.01);
Abstract
The present embodiment relates to an optical fiber preform producing method for effectively suppressing breaking of symmetry of refractive index profile defined on a cross section of an optical fiber preform. In the present embodiment, when producing a center glass rod forming a part of the optical fiber preform, prior to grinding an outer peripheral portion of an intermediate glass rod in which an element-doped region is formed by collapse, an non-defective article determination regarding the intermediate glass rod to be a grinding target is performed.