Optically variable device comprising magnetic flakes
US9827805B2 · kind B2 · utility
0Cited by
11References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 12, 2015 |
| Grant date | Nov 28, 2017 |
| Priority date | — |
| Expiry date | May 8, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24893
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An optically variable device may be manufactured by aligning magnetic flakes on a surface of an adhesive layer by applying the flakes onto the adhesive layer surface in presence of a magnetic field, and curing the adhesive layer having magnetic flakes adhered to the adhesive layer. When cured, the adhesive layer holds the magnetic flakes oriented, enabling subsequent encapsulation of the oriented magnetic flakes in a coating layer on the adhesive layer, without a substantial loss of orientation of the magnetic flakes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.