Process for providing marking on security papers
US7514188B2 · kind B2 · utility
0Cited by
3References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2004 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Apr 25, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for providing a security paper, in particular a banknote, with a coloured marking, comprising providing a photosensitive preparation on a portion of said document and submitting at least selected areas of said portion to a light beam, wherein said preparation is capable of forming a film on said portion and comprises a substance capable of producing colloidal metal particles under the effect of UV irradiation, and said areas are irradiated by means of an UV-light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.