Security markers for determining composition of a medium
US7256398B2 · kind B2 · utility
34Cited by
27References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 2, 2005 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Dec 31, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V20/80
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of determining a component of a medium comprises illuminating the medium to excite a marker associated with the component. Detected photoluminescent emission from the marker in response to the excitation is compared with one or more emission profiles. The component is identified based on a match between the detected photoluminescent emission and at least one of the emission profiles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.