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. 16, 2013
Filed:
Jun. 05, 2008
Frank Hoff, Greppin, DE;
Michael Muschler, Rosslau, DE;
Udo Peper, Halle, DE;
Sven Schmidt, Zorbig, DE;
Steffen Zwarg, Wolfen, DE;
Hans-georg Fritsche, Bobbau, DE;
Frank Hoff, Greppin, DE;
Michael Muschler, Rosslau, DE;
Udo Peper, Halle, DE;
Sven Schmidt, Zorbig, DE;
Steffen Zwarg, Wolfen, DE;
Hans-Georg Fritsche, Bobbau, DE;
Heraeus Quarzglas GmbH & Co. KG, Hanau, DE;
Abstract
A known method for producing a cylinder of quartz glass comprises a method step in which a porous SiObody comprising a central inner bore, a lower end and an upper end is sintered in a sintering furnace zone by zone, starting from the upper end, to obtain the quartz glass cylinder, a holding device being used by means of which the SiObody is held standing in vertical orientation during a first sintering phase and suspended in a second sintering phase. Starting therefrom, to indicate a method by means of which even heavy bodies of porous SiOcan be reliably held during sintering, it is suggested according to the invention that the holding device comprises a fusion body of quartz glass which is arranged in the area of the upper end in the inner bore and which in the course of the first sintering phase fuses with the quartz glass of the SiObody and which during the second sintering phase is in operative interaction with a holding element of the holding device and together with said element contributes to a suspended holding of the SiObody to be sintered.