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:
Sep. 01, 1987
Filed:
May. 31, 1985
Kiyoshi Yokokawa, Gunma, JP;
Kazuo Koya, Gunma, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
The quartz glass-made optical fiber of the invention is formed of the core portion and the cladding portion each doped with fluorine to decrease the refractive index, the concentration of fluorine being higher in the cladding than in the core, so that the core portion has a refractive index lower by 0.01 to 0.1% than that of an undoped fused quartz glass and the cladding portion has a refractive index lower by at least 0.2% than that of the core portion. By virtue of the fluorine doping throughout, the optical fiber is free from the drawbacks due to the oxygen deficiency in the fused quartz glass and the light transmission performance thereof is remarkably stable. A method for the preparation of the optical fiber is proposed including the steps of silica particle deposition by the flame hydrolysis of a silicon compound, doping with a fluorine compound and vitrification for each of the core and the cladding portions.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile