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. 12, 2013
Filed:
May. 23, 2007
Sven Schmidt, Brehna, DE;
Udo Peper, Halle/Saale, DE;
Andreas Helm, Thalheim, DE;
Juergen Roeper, Roitzsch, DE;
Sven Schmidt, Brehna, DE;
Udo Peper, Halle/Saale, DE;
Andreas Helm, Thalheim, DE;
Juergen Roeper, Roitzsch, DE;
Heraeus Quarzglas GmbH & Co. KG, Hanau, DE;
Abstract
Method for producing a semifinished product from synthetic quartz glass Methods for producing a semifinished product from synthetic quartz glass by plastic deformation of a softened SiOmass in a melt mold are known. Starting from this, to avoid fusion defects as much as possible and to obtain semifinished products of quartz glass in a reproducibly high quality, a method is suggested that comprises the following steps: (a) providing a porous SiOsoot body, (b) zonewise sintering of the SiOsoot body in the melt mold at a sintering temperature and during a sintering period with formation of a completely sintered transparent quartz glass body, and directly thereafter (c) shaping the sintered quartz glass body by softening in the melt mold with formation of a viscous quartz glass mass which fills the volume of the melt mold entirely or partly, and (d) cooling the quartz glass mass and removing the mass from the melt mold with formation of the semifinished product.