Colored photosensitive opal glasses
US5019538A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1989 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Nov 13, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C4/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention is directed to photosensitively opacifiable glasses consisting essentially, in weight percent, of about 14-18% Na.sub.2 O, 0-6% Zno, 6-12% Al.sub.2 O.sub.3, 0-5% B.sub.2 O.sub.3, 0-0.2% Sb.sub.2 O.sub.3, 0-0.1% SnO, 65-72% SiO.sub.2, and 0.007-0.04% Ag, 0.008-0.05% CeO.sub.2, 0.7-1.25% Br, and 1.5-2.5% F as analyzed in the glass, the sum of those components constituting at least 90% of the total composition, which, through an exposure to ultraviolet radiation, followed by a three-step heat treatment, and then a re-exposure to ultraviolet radiation at an elevated temperature, can be converted into a colored opal glass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.