Apparatus for maintaining the security of a substrate
US6761378B2 · kind B2 · utility
7Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2002 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Oct 28, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24909
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apparatus for maintaining security of a substrate having an optically verifiable mark including a partially demetallized metallic layer which forms a control graphic, a layer of optically active pigments adjacent the metallic layer, and an adhesive layer adjacent the layer of optically active pigments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.