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:
Nov. 08, 1983
Filed:
Oct. 19, 1981
Applicant:
Inventors:
Rolf Bruning, Bruchkobel, DE;
Poul-Erik Breidenbach, Bruchkobel, DE;
Norbert Cibis, Frankfurt am Main, DE;
Fritz Aldinger, Rodenbach, DE;
Waltraud Werdecker, Hanau, DE;
Assignee:
Heraeus Quarzschmelze GmbH, Hanau am Main, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B / ; C03B / ; C03C / ;
U.S. Cl.
CPC ...
65 31 ; 65 32 ; 65 61 ; 65111 ;
Abstract
For the production of a bubble-free vitreous material, and in particular bubble-free vitreous silica, bubbles-containing vitreous material is exposed in a furnace, at a temperature which reduces its viscosity to a value between 10.sup.13.5 and 10.sup.8 Pa.sec, to the omnidirectional pressure ranging from 100 to 3000 bars of a gas which is insoluble in the vitreous material for a period of not less than 10 minutes and is then cooled.