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:
May. 07, 2002
Filed:
Jan. 14, 2000
Waltraud Werdecker, Hanau, DE;
Johann Leist, Altenstadt, DE;
Heinz Fabian, Grossostheim, DE;
Rolf Göbel, Gelnhausen, DE;
Bruno Uebbing, Alzenau, DE;
Erich Rosin, Bruchköbel, DE;
Heraeus Quarzglas GmbH & Co. KG, Hanau, DE;
Abstract
Based on a known process for the manufacture of opaque quartz glass, by mixing SiO particles and an additive which is volatile at a melting temperature, forming a body and melting said body with an advancing melt front forming in the body, it is proposed according to the invention that in order to reduce the danger of contamination, a body ( ) be formed with an inner bore ( ) and be heated in such a manner that the melt front ( ) advances from the inner bore ( ) to the outside. The article of pure opaque quartz glass according to the invention has high resistance to temperature change, high mechanical strength and good chemical durability. It is distinguished by an opening ( ) enclosed by an inner wall ( ), with an inner SiO surface layer ( ) having a layer thickness ranging from 30 mm to 500 mm and a density of at least 2.15 g/cm .