Patent · US Expired

Lead- and arsenic-free optical lanthanum flint glasses

US7297647B2 · kind B2 · utility

3Cited by

1References

14Claims

0Family size

Assignee

Schott AG · DE

Inventors

Silke Wolff · Hückeswagen, DE
Karl Mennemann · Taunusstein, DE
Ute Woelfel · Bingen, DE

Key dates

Filing date	Feb 28, 2005
Grant date	Nov 20, 2007
Priority date	—
Expiry date	Apr 14, 2025

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S501/903
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The present invention relates to lead and arsenic free optical glasses, used for the application areas imaging, digital projection, photolithography, laser technology, wafer/chip technology as well as telecommunication, optical communications engineering, optics, illumination and in the automotive sector. The glasses have a refraction power of from 1.73≦nd≦1.82 and an Abbé value of 43≦vd≦53 with good chemical consistency and excellent crystallisation stability with the following composition (in weight-%):

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