Security card and security card blank
US4747620A · kind A · utility
62Cited by
12References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1986 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Aug 13, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/904
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A security card blank comprises a plurality of superposed layers (5,5',6,7,8,9) including a metallic layer (5,5'). The metallic layer comprises any radiation absorbent, metal, metalloid, or their alloys or derivatives, such as oxides or sulphides. The metallic layer (5,5') is positioned within the card blank and is imageable only under the influence of high intensity radiation to produce a security card. After imaging, at least part of the imaged metallic layer is detectable from outside the card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.