Process for forming two different indices of refraction in a glass ceramic
US4069031A · kind A · utility
2Cited by
21References
6Claims
0Family size
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Inventor
Key dates
| Filing date | Nov 30, 1976 |
| Grant date | Jan 17, 1978 |
| Priority date | — |
| Expiry date | Nov 30, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C3/076
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Thermally crystallizable glasses of the Na.sub.2 O--Ta.sub.2 O.sub.5 --SiO.sub.2 and the Na.sub.2 O--Li.sub.2 O--Ta.sub.2 O.sub.5 --SiO.sub.2 systems, and glass-ceramics made therefrom which are highly transparent, have high indices of refraction, and excellent strength properties. By varying the heat treatment schedule for crystallization of a glass to a glass-ceramic, a specific high index of refraction coming within a prescribed range may be imparted to the finished, transparent glass-ceramic. A transparent glass-ceramic having two or more different indices of refraction may also be produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.