Optically variable security device
US7054042B2 · kind B2 · utility
34Cited by
10References
49Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2001 |
| Grant date | May 30, 2006 |
| Priority date | — |
| Expiry date | Nov 13, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2250/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optically variable security device comprising a thin film reflection filter structure (23) which exhibits a first optically variable effect; and a relief structure (20) on or in the thin film reflection filter structure which exhibits a second optically variable effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.