Black-to-color shifting security element
US8147932B2 · kind B2 · utility
25Cited by
17References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2006 |
| Grant date | Apr 3, 2012 |
| Priority date | — |
| Expiry date | Dec 5, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24802
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The invention discloses a security element for a banknote, a document of value, right or identity, a ticket, a label, a branded good identifier, or a tax banderole. The element comprises a combination of a coating containing at least one optically variable pigment having a substantial viewing-angle dependent color variation, with at least one selective spectral absorbing material, which blocks out visible spectral components reflected by the optically variable pigment at orthogonal incidence. The security element appears black when viewed at orthogonal angle, and colored when viewed at grazing angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.