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. 10, 2015
Filed:
Nov. 23, 2012
Heraeus Quarzglas Gmbh & Co. KG, Hanau, DE;
Heinz Fabian, Grossostheim, DE;
Juergen Roeper, Sandersdorf-Brehna, DE;
Heraeus Quarzglas GmbH & Co. KG, Hanau, DE;
Abstract
A method for producing synthetic quartz glass comprises providing a liquid SiOfeedstock material containing mainly octamethylcyclotetrasiloxane D4, vaporizing the SiOfeedstock material into a feedstock vapor, converting the feedstock vapor into SiOparticles, depositing the SiOparticles on a deposition surface while forming a porous SiOsoot body, and vitrifying the SiOsoot body while forming the synthetic quartz glass. To produce large-volume cylindrical soot bodies with outer diameters of more than 300 mm of improved material homogeneity, the liquid feedstock material contains additional components comprising hexamethylcyclotrisiloxane D3 and its linear homolog with a weight fraction mD3, dodecamethylcyclohexasiloxane D6 and its linear homolog with a weight fraction mD6, and tetradecamethylcycloheptasiloxane D7 and/or hexadecamethylcyclooctasiloxane D8 and its linear homologs with a weight fraction mD7+. The weight ratio mD3/mD6 is in a range between 0.5 and 500 and the weight fraction mD7+ is at least 20 wt. ppm.