Mother glass composition for graded index lens
US6476975B1 · kind B1 · utility
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8Claims
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Key dates
| Filing date | Nov 13, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Jan 11, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C3/097
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An SiO2-TiO2-Li2O-Na2O-based glass composition containing no lead oxide having incorporated therein specific amounts of specific components which are selected from oxides of the metal elements having an atomic number of 30 (Y) to 73 (Ta) and which hardly cause coloration of glass. The glass composition has a desirable refractive index, hardly undergoes devitrification, and hardly develops cracks on ion exchanging and is suitable as glass for a graded index lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.