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:
Jun. 29, 2004
Filed:
Jul. 10, 2001
Applicant:
Inventors:
Gabriele Korus, Leipzig, DE;
Hilmar Laudahn, Bitterfeld, DE;
Martin Arndt, Bitterfeld, DE;
Udo Gertig, Johannesberg, DE;
Assignee:
Heraeus Quarzglas GmbH & Co. KG, Hanau, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B 1/909 ;
U.S. Cl.
CPC ...
C03B 1/909 ;
Abstract
Known is a method of producing a quartz glass crucible in which a crucible base body is provided at least in part with an inner layer in which the formation of cristobalite is induced by using a crystallization promoter. On the basis thereof, in order to provide an inexpensive method of producing a quartz glass crucible with reproducible characteristics for long service lives, it is suggested according to the invention that the crystallization promoter and a reducing substance are introduced into the inner layer.