Optically detectable security feature
US7129506B2 · kind B2 · utility
8Cited by
17References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2004 |
| Grant date | Oct 31, 2006 |
| Priority date | — |
| Expiry date | Jul 31, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24802
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An optically detectable security marker for emitting light at a pre-selected wavelength. The marker comprises a rare earth dopant and a carrier incorporating the rare earth dopant. The interaction of the carrier and the dopant is such that the fluorescent fingerprint of the marker is different from that of the rare earth dopant. The marker may be incorporated into a plurality of items, such as fluids, for example paint, fuel or ink, and laminar products such as paper or banknotes or credit cards.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.