High brightness durable retro-reflecting microspheres and method of making the same
US5670209A · kind A · utility
70Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1996 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Jan 23, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2996
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
High brightness durable retro-reflecting microspheres for retro-reflection and related uses (and a novel method of forming the same) is provided embodying a retro-reflective vitreous glass microsphere encapsulated in a hardened clear non-vitreous metal-oxide ceramic shell of substantially the same index of fraction as the microsphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.