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:
Apr. 01, 2008
Filed:
Jul. 09, 2001
Johann Leist, Altenstadt, DE;
Rolf Göbel, Gelnhausen, DE;
Helmut Fritz, Bierstein, DE;
Heraeus Quarzglas GmbH & Co. KG, Hanau, DE;
Abstract
In a device () for the manufacture of a quartz glass crucible (), one section () of a wall () of the rotating quartz glass crucible () is heated at one time by means of at least two electrode arrangements () distributed uniformly at the circumference of the quartz glass crucible () and generating a first and another electric arc. By providing several electrode arrangements (), the cooling-down phase of the sections () until their reaching the subsequent heating zone () can be shortened, and thus an undesirable high temperature difference of the wall () can be avoided. Moreover, the required thermal output of each individual electrode arrangement () can be reduced, so that evaporation phenomena and connected bubble formation can be reduced. In addition to the higher quality that can be reached in this way, the duration of the manufacturing process is reduced.