Securtiy element
US5714213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1994 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Apr 12, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31681
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A security element for the authentication of a substrate has a pattern comprising optical diffraction elements which are embossed in a carrier material of plastic material and unembossed neutral areas. On the embossing side of the carrier material a reflecting layer covers only surfaces with relief structures of the diffraction elements while the neutral areas which lie between are free of the reflecting layer and are therefore non-reflecting. If the security element is stuck in the form of a stamp onto the substrate and the carrier material is transparent, image portions, which are covered by the stamp, of a feature on the substrate can be discerned through the neutral areas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.