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:
Mar. 14, 1989
Filed:
Dec. 10, 1987
Applicant:
Inventors:
Michihisa Kyoto, Yokohama, JP;
Naoki Yoshioka, Yokohama, JP;
Gotaro Tanaka, Yokohama, JP;
Hiroo Kanamori, Yokohama, JP;
Minoru Watanabe, Yokohama, JP;
Motohiro Nakahara, Mito, JP;
Assignees:
Nippon Telegraph & Telephone Public Corporation, Tokyo, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03P / ; C03B / ;
U.S. Cl.
CPC ...
65-312 ; 65-311 ; 65DI / ;
Abstract
A method for producing a glass preform for optical fibers in which fluorine is efficiently incorporated into the preform without incorporation of Fe or Cu. A fine glass particle mass, made primarily of quartz, is converted into transparent glass by heating it in a gas atmosphere containing at least a fluorine-based compound gas and a chlorine-based compound gas. The preferred heating range is 1,100.degree. to 1,400.degree. C.