Photonic crystal security device
US8883273B2 · kind B2 · utility
3Cited by
11References
51Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 10, 2007 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | Jun 25, 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 of which incident light received by the crystal is selectively reflected or transmitted by the crystal to generate a first optically variable effect observable over a first set of directions. Incident light received by the crystal is also selectively reflected or transmitted by the crystal to generate an optical effect observable over a second set of directions that is different from the first set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.