Security devices incorporating optically variable adhesive
US8164810B2 · kind B2 · utility
8Cited by
25References
22Claims
0Family size
Inventors
Key dates
| Filing date | Mar 5, 2007 |
| Grant date | Apr 24, 2012 |
| Priority date | — |
| Expiry date | Nov 15, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2270/24
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A structure for providing an optical effect includes first and second substrates hot stamped together by an adhesive. The adhesive includes an energy activated binder having a plurality of particles distributed therein or thereon for providing the optical effect detectable through the first substrate. The particles may be optically variable flakes, thin film light interference flakes, diffractive flakes, and reflective flakes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.