Patent · US Expired

Apparatus for manufacturing stria-free, bubble-free and homogeneous quartz-glass plates

US4666495A · kind A · utility

10Cited by

5References

7Claims

0Family size

Assignee

Heraeus Quarzschmelze GmbH · DE

Inventors

Karl Kreutzer · Leverkusen, DE
Fritz Simmat · Gelnhausen, DE

Key dates

Filing date	Apr 4, 1986
Grant date	May 19, 1987
Priority date	—
Expiry date	Apr 4, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S65/08
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method of manufacturing practically stria-free, bubble-free, and homogeneous quartz-glass plates of any desired configuration and with a surface area that exceeds the cross-section of the full circular quartz-glass cylinder that is employed as a starting material. The cylinder is continuously lowered into a furnace shell flooded with an inert gas, in which it is heated to a flowing temperature in the range of 1700.degree. to 1900.degree. C. until some of the quartz-glass flows off into a graphite crucible. The crucible is preferably clad with zirconium-oxide.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.