Thallium-containing optical glass composition
US4495299A · kind A · utility
7Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1983 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Sep 6, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S501/903
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A thallium-containing optical glass composition which contains the following oxides in the indicated proportions in mole %: ______________________________________ SiO.sub.2 35-80 Tl.sub.2 O 4-26 Tl.sub.2 O + R.sub.2 O 8-42 (in which R is an alkali metal) ZnO 6-26 ZrO.sub.2 0-2 Al.sub.2 O.sub.3 0-8 SnO and/or SnO.sub.2 0-5 B.sub.2 O.sub.3 0-less than 10 ______________________________________ and satisfies the following relations: EQU O.ltoreq.K.sub.2 O.ltoreq.10 EQU 4.ltoreq.Na.sub.2 O+Li.sub.2 O.ltoreq.26 EQU 0.1.ltoreq.ZrO.sub.2 +Al.sub.2 O.sub.3 +SnO and/or SnO.sub.2 .ltoreq.8 ##EQU1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.