Security device having optically variable device portion and method of making the same
US9279927B2 · kind B2 · utility
0Cited by
9References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 15, 2013 |
| Grant date | Mar 8, 2016 |
| Priority date | — |
| Expiry date | Jan 12, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/364
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A security device includes a liquid crystal layer having one of a cholesteric phase, a nematic phase, and a cholesteric phase and having molecules therein aligned volumetrically in a predetermined manner to form a predetermined diffractive optical pattern or image. The molecules of the liquid crystal layer are volumetrically aligned in the predetermined manner through at least a portion of the thickness of the liquid crystal layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.