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. 22, 2009
Filed:
Oct. 05, 2007
Iwao Shimotakahara, Tokyo, JP;
Iwao Shimotakahara, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A tension-absorbing cladding layer is formed around a cladding layer, with a refractive index equal to that of a center core region or higher. The center core region has a relative refractive index difference of −0.1% to 0% with respect to a pure silica glass, a chlorine concentration of wt % to 0.10 wt %, and a fluorine concentration of 0.10 wt % to 0.30 wt %. The tension-absorbing cladding layer has a relative refractive index difference of 0% to 0.05% with respect to the pure silica glass and a chlorine concentration of 0.15 wt % or lower. A ratio of an outer diameter of the tension-absorbing cladding layer to an outer diameter of the cladding layer is 1.10 to 1.40.