Optically variable element
US7215450B2 · kind B2 · utility
8Cited by
6References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 9, 2003 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Jan 29, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/34
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention relates to an optically variable element having surface portions with achromatic surface structures and different scatter, diffraction and reflection characteristics. The achromatic surface structures are combined with a thin-film structure, whereby upon turning or tilting the optically variable element, it is not the impression of a continuous color transition, but a defined, almost discrete color change that is produced for the viewer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.