Fluorophosphate opal glasses
US4298390A · kind A · utility
16Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1980 |
| Grant date | Nov 3, 1981 |
| Priority date | — |
| Expiry date | Aug 13, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C10/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention is directed to spontaneous opal glasses wherein Ba.sub.2 F(PO.sub.4) constitutes the predominant crystalline opal phase. The glasses exhibit softening points in excess of 710.degree. C., excellent chemical durability, and consist essentially, in weight percent on the oxide basis, of 6-10% Na.sub.2 O, 1-6% K.sub.2 O, 4-11% BaO, 9-18% Al.sub.2 O.sub.3, 50-70% SiO.sub.2, 3.5-7% P.sub.2 O.sub.5, and 1-4% F.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.