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. 14, 1989
Filed:
Apr. 04, 1985
Applicant:
Inventors:
Michihisa Kyoto, Yokohama, JP;
Shuzo Suzuki, Yokohama, JP;
Minoru Watanabe, Yokohama, JP;
Motohiro Nakahara, Mito, JP;
Assignees:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Nippon Telegraph & Telephone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G02B / ; C03C / ;
U.S. Cl.
CPC ...
350 9634 ; 350 9629 ; 350 9630 ; 350 9631 ; 65-312 ; 65DI / ;
Abstract
A quartz optical fiber comprising a core having a higher refractive index and made of pure quartz containing fluorine and phosphorus pentoxide and a cladding having a lower refractive index, a weight ratio of fluorine and phosphorus pentoxide in the core being larger than 1 (one), which is substantially free from unstability of the glass structure.