Azimuthally modulated scattering device
US11921303B2 · kind B2 · utility
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9References
7Claims
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Key dates
| Filing date | Feb 23, 2021 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Jul 12, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/0032
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Optical elements with anisotropic, patterned surface relief microstructures in which information is encoded in the distribution of the orientation of different zones. From the analysis of the distribution of the light scattered from the element, the orientation distribution in the element and therefore the encoded information can be evaluated. The elements are particularly useful for securing documents and articles against counterfeiting and falsification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.