Security markers for indicating condition of an item
US7378675B2 · kind B2 · utility
29Cited by
21References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2005 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Nov 2, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V20/80
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of indicating the condition of an item comprises illuminating the item to excite one or more photoluminescent markers incorporated within the item. Photoluminescent emission from the markers in response to the excitation is compared to one or more pre-defined photoluminescent signatures indicating different conditions of the item.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.