Optically clear copper halide photochromic glass articles
US4222781A · kind A · utility
14Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1979 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Aug 16, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C4/065
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Silver-free, cadmium-free, copper halide-based alkali aluminoborosilicate glasses exhibiting good optical clarity and good photochromic darkening and fading are provided by controlling the alkali, Al.sub.2 O.sub.3 and B.sub.2 O.sub.3 concentrations in the base glass and/or adding MoO.sub.3 or WO.sub.3 thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.