Security document including a laserizable layer and a pattern for illuminating in order to color a grayscale image, and corresponding fabrication and reading methods
US11364735B2 · kind B2 · utility
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22Claims
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Key dates
| Filing date | Jun 8, 2020 |
| Grant date | Jun 21, 2022 |
| Priority date | — |
| Expiry date | Jun 8, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/20
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A security document may include a laserizable first layer including a grayscale image formed by laserizing; a color pattern that is in alignment with the grayscale image; and a second layer arranged between the first layer and the pattern, such that the first layer is above the second layer, and the pattern is below the second layer. The second layer may be more opaque than the first layer, such that when observing the security document from the top, the grayscale image appears to be colored by the color pattern only when the bottom of the security document is being illuminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.