Patent · US Expired

Highly refractive optical glass with refractive indices >1.83 and Abbe numbers <25, and with very good chemical stability

US4734389A · kind A · utility

17Cited by

3References

9Claims

0Family size

Assignee

Schott Glaswerke · DE

Inventors

Danuta Grabowski · Wiesbaden, DE
Ludwig Ross · Klein-Winternheim, DE
Volkmar Geiler · Ingelheim am Rhein, DE

Key dates

Filing date	Feb 7, 1986
Grant date	Mar 29, 1988
Priority date	—
Expiry date	Feb 7, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S501/901
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A highly refractive optical glass (n.sub.d .gtoreq.1.83) with high dispersion (v.sub.d .ltoreq.25) and very good chemical stability at relatively low density (.delta..ltoreq.3.5 g/cm.sup.3) consists of (in weight percent) SiO.sub.2 19-25, Na.sub.2 O 7-10, K.sub.2 O 4-7, Cs.sub.2 O 0-12, Cao 0.5-2.0, BaO 9-15, TiO.sub.2 25-30, ZrO.sub.2 0-6, Nb.sub.2 O.sub.5 16-20, WO.sub.3 0-3, with Nb.sub.2 O.sub.5 :TiO.sub.2 =0.6-0.71.

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