Bragg diffracting security markers
US9327538B2 · kind B2 · utility
0Cited by
7References
28Claims
0Family size
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Inventors
Key dates
| Filing date | Jan 5, 2006 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Mar 6, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/20
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method of marking an article with a watermark that diffracts radiation according to Bragg's law is disclosed. The watermark includes a periodic array of particles fixed in a matrix. The watermark may change colors with viewing angle, disappear and reappear with viewing angle or may diffract non-visible radiation that is detectable at certain angles of detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.