Security element
US5538753A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1995 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | Jun 2, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/324
- 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 therebetween 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 metal 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.