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. 22, 2011
Filed:
Dec. 24, 2003
Antonio Adigrat, Battipaglia, IT;
Stefano Grieco, Giffoni Vallepiana, IT;
Valeria Caronna, Salerno, IT;
Giuseppe Ferri, Ivrea, IT;
Franco Cocchini, Salerno, IT;
Antonio Adigrat, Battipaglia, IT;
Stefano Grieco, Giffoni Vallepiana, IT;
Valeria Caronna, Salerno, IT;
Giuseppe Ferri, Ivrea, IT;
Franco Cocchini, Salerno, IT;
Prysmian Cavi E Sistemi Energia S.R.L., Milan, IT;
Abstract
A process for producing a low-attenuation optical fiber by producing a soot core preform by chemical deposition on a substrate; removing the substrate from the soot core preform, thereby forming a central hole along the soot preform; drying and consolidating the soot core preform in a consolidation furnace to form a glass core preform; heating the glass preform in the consolidation furnace above a glass melting temperature to produce a reduction of the diameter of the central hole; and stretching the glass core preform to completely close the central hole.