Photonic crystal security device
US8927072B2 · kind B2 · utility
6Cited by
11References
62Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 10, 2007 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | Jun 7, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/25
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An optically variable security device comprises a photonic crystal which, upon receipt of incident light, generates a first optical effect, and which, when the device is subjected-to-an external stimulus, generates a second optical effect that is different from the first optical effect. At least one of the first and second optical effects is an optically variable effect observable over a set of directions. The optically variable effect is caused by the light being selectively reflected or transmitted by the crystal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.