Diffractive security element with individualized code
US8308197B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2008 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | May 17, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/328
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Described is a security element for increasing the forgery-proof nature of a security document, in particular an identity card or pass, a passport or an identification card. The security element (1) has a first diffractive region (15) having an open code which is visible with a naked eye. The first diffractive region further has a concealed code which is not visible with the naked eye and which can be reconstructed from the arrangement of diffractive microregions disposed in the first region (1) and/or from the structure of the first diffractive region (1). Further described is a method of increasing the forgery-proof nature of a security document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.