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. 07, 2006
Filed:
Dec. 09, 2003
Tetsuji Ueda, Koriyama, JP;
Akira Fujinoki, Koriyama, JP;
Hiroyuki Nishimura, Koriyama, JP;
Martin Trommer, Kahl am Main, DE;
Stefan Ochs, Bad Camberg, DE;
Tetsuji Ueda, Koriyama, JP;
Akira Fujinoki, Koriyama, JP;
Hiroyuki Nishimura, Koriyama, JP;
Martin Trommer, Kahl am Main, DE;
Stefan Ochs, Bad Camberg, DE;
Heraeus Quarzglas GmbH Co. KG, Hanau, DE;
Shin-Etsu Quartz Products Ltd., Tokyo, JP;
Abstract
An object of the present invention is to provide an improved blank such that an optical member of a high homogeneity can be obtained therefrom, and to provide a vessel and a heat treatment method for heat-treating a highly uniform synthetic quartz blank. In a first aspect of the invention a special designed blank is provided showing a concave shaped outer surface. In a second aspect of the invention a special designed vessel for heat-treating blanks is provided, whereby the degree of heat emission at the center is set higher than that of the surroundings.