Photonic crystal security device and method
US9272564B2 · kind B2 · utility
4Cited by
3References
47Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 14, 2008 |
| Grant date | Mar 1, 2016 |
| Priority date | — |
| Expiry date | Feb 12, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/36
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method of forming an optically variable security device is provided. In the method, a photonic crystal material is provided and a process is performed upon the material which causes deformation of the material so as to form a first region (A) for which incident light received by the crystal material is selectively reflected or transmitted to generate a first optically variable effect, and a second region (B) for which incident light received generates an optical effect, different from the first optically variable effect. Corresponding devices having first and second regions are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.