Printing color images visible under UV light on security documents and valuable articles
US8085438B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2007 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Oct 26, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M3/144
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A new method of creating fluorescent color images visible under UV light is proposed, which relies on fluorescent colorants obtained by superposing fluorescent ink dots, on juxtaposed halftoning, and on mapping the gamut of the image to be reproduced into the gamut of the fluorescent colorants. The resulting color images are invisible under daylight and have, under UV light, a high resemblance with the original images. Applications comprises the protection of security documents and valuable articles, as well as publicity, fashion and night life, where fluorescent images viewed in the dark under UV illumination have a strongly appealing effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.