Transparent beads and their production method
US6514892B1 · kind B1 · utility
55Cited by
42References
7Claims
0Family size
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Key dates
| Filing date | May 2, 2000 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | May 2, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Transparent solid, fused microspheres are provided. In one embodiment, the microspheres contain alumina, zirconia, and silica in a total content of at least about 70% by weight, based on the total weight of the solid, fused microspheres, wherein the total content of alumina and zirconia is greater than the content of silica, and further wherein the microspheres have an index of refraction of at least about 1.6 and are useful as lens elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.