Magnetic assemblies, apparatuses and processes for producing optical effect layers comprising oriented non-spherical magnetic or magnetizable pigment particles
US11577272B2 · kind B2 · utility
1Cited by
12References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 2019 |
| Grant date | Feb 14, 2023 |
| Priority date | — |
| Expiry date | Nov 19, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/369
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to the field of magnetic assemblies, magnetic apparatuses and processes for producing optical effect layers (OEL) comprising magnetically oriented non-spherical magnetic or magnetizable pigment particles on a substrate and providing an impression of a crescent moon-shaped element moving or rotating upon tilting the optical effect layer (OEL). In particular, the present invention relates to magnetic assemblies, magnetic apparatuses and processes for producing said OELs as anti-counterfeit means on security documents or security articles or for decorative purposes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.