Processes for producing optical effects layers
US11577273B2 · kind B2 · utility
1Cited by
13References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2019 |
| Grant date | Feb 14, 2023 |
| Priority date | — |
| Expiry date | Jun 28, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2201/003
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The invention relates to the field of the protection of security documents such as for example banknotes and identity documents against counterfeit and illegal reproduction. In particular, the present invention provides processes for optical effect layers (OEL) exhibiting two or more nested indicia using a magnetic assembly comprising i) a soft magnetic plate (x31) comprising a) one or more voids (V) and b) one or more indentations (I) and/or one or more protrusions (P), and ii) one or more dipole magnets (x32).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.