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:
Jul. 02, 2019
Filed:
Jun. 27, 2017
Heraeus Quarzglas Gmbh & Co. KG, Hanau, DE;
Hardy Baierl, Donndorf, DE;
Stephan Grimm, Jena, DE;
Kay Schuster, Jena, DE;
Jan Dellith, Jena, DE;
Andreas Langner, Freigericht, DE;
Gerhard Schoetz, Aschaffenburg, DE;
Walter Lehmann, Leipzig, DE;
Thomas Kayser, Leipzig, DE;
Heraeus Quarzglas GmbH & Co., KG, Hanau, DE;
Abstract
A method for producing rare earth metal-doped quartz glass includes the steps of (a) providing a blank of the rare earth metal-doped quartz glass, and (b) homogenizing the blank by softening the blank zone by zone in a heating zone and by twisting the softened zone along a rotation axis. Some rare earth metals, however, show a discoloration of the quartz glass, which hints at an unforeseeable and undesired change in the chemical composition or possibly at an inhomogeneous distribution of the dopants. To avoid this drawback and to provide a modified method which ensures the production of rare earth metal-doped quartz glass with reproducible properties, during homogenization according to method step (b), the blank is softened under the action of an oxidizingly acting or a neutral plasma.