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:
Oct. 10, 2017
Filed:
Jul. 28, 2015
Applicant:
Furukawa Electric Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
FURUKAWA ELECTRIC CO., LTD., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C03B 37/018 (2006.01); C03B 37/014 (2006.01); G02B 6/02 (2006.01);
U.S. Cl.
CPC ...
C03B 37/01853 (2013.01); C03B 37/0142 (2013.01); C03B 37/01446 (2013.01); C03B 37/01453 (2013.01); G02B 6/02 (2013.01); C03B 2201/12 (2013.01); C03B 2201/50 (2013.01); C03B 2203/22 (2013.01); C03B 2207/34 (2013.01); C03B 2207/50 (2013.01);
Abstract
A method of producing a glass preform including: forming a porous glass soot configured by an inner deposition soot deposited on a start material and an outer deposition soot deposited outside the inner deposition soot; and sintering, after the forming, the porous glass soot while doping with fluorine to form a glass body including an inner glass portion and an outer glass layer. An amount of the fluorine, with which the inner deposition soot is doped at the sintering, is equal to or more than 0 g/cmand less than an amount of the fluorine with which the outer deposition soot is doped.