Optically variable security devices
US11768321B2 · kind B2 · utility
1Cited by
156References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2022 |
| Grant date | Sep 26, 2023 |
| Priority date | — |
| Expiry date | Sep 28, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical device is formed by hot stamping a demetallized hologram to an optically variable foil or to a coating of optically variable ink. In another embodiment a hologram is hot stamped to a banknote or document printed with a color-shifting ink.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.