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. 22, 2013
Filed:
Aug. 16, 2011
Takahiro Mitsumori, Tokyo, JP;
Yasutomi Iwahashi, Tokyo, JP;
Akio Koike, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A process for producing a porous quartz glass body containing hydrolyzing a metal dopant precursor and an SiOprecursor in a flame of a burner to form glass fine particles, and depositing and growing the formed glass fine particles on a base material, in which the burner has at least two nozzles, and in which a mixed gas containing (A) a metal dopant precursor gas, (B) an SiOprecursor gas, (C) one gas of Hand O, and (D) one or more gases selected from the group consisting of a rare gas, N, CO, a hydrogen halide and HO, with a proportion of the gas (D) being from 5 to 70 mol %; and (E) the other gas of Hand Oof (C), are fed into different nozzles of the burner from each other.