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:
Jan. 19, 2010
Filed:
Nov. 09, 2004
Kentaro Ichii, Sakura, JP;
Takakazu Gotoh, Sakura, JP;
Naritoshi Yamada, Sakura, JP;
Koichi Harada, Sakura, JP;
Kentaro Ichii, Sakura, JP;
Takakazu Gotoh, Sakura, JP;
Naritoshi Yamada, Sakura, JP;
Koichi Harada, Sakura, JP;
Fujikura Ltd., Tokyo, JP;
Abstract
A method for fabricating a porous silica preform includes the steps of supplying fuel gas for generating an oxyhydrogen flame to a glass synthesizing burner; supplying Gas A containing silicon and Gas B containing fluorine to the burner; synthesizing glass particles; and depositing the glass particles around a starting rod, in which when glass particles are deposited directly on the starting rod, a supply of Gas A and a supply of Gas B supplied to the burner are adjusted so that a ratio of the number of fluorine atoms to the number of silicon atoms in the gas supplied to the burner satisfies the following Formula (1):{(number of F atoms)/(number of Si atoms)}≦0.1   (1).