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, 2002
Filed:
Apr. 20, 2000
Motoyuki Yamada, Nakakubiki-gun, JP;
Hisatoshi Otsuka, Nakakubiki-gun, JP;
Koji Matsuo, Nakakubiki-gun, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
A process for manufacturing synthetic quartz glass involves feeding a quartz glass-forming raw material to a high-temperature gas zone within a chamber, converting the quartz glass-forming raw material into quartz soot, and forming synthetic quartz glass from the soot. A suspended soot-discharging gas which has been flow-straightened in a suspended soot discharging direction flows through the chamber in the vicinity of the high-temperature gas zone. This process keeps free suspended soot from settling onto the surface of the quartz ingot where fusion and growth take place, thereby preventing the formation of bubbles within the quartz glass under growth.