Use of fluorescent inks for document authentication
US9012871B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 1, 2014 |
| Grant date | Apr 21, 2015 |
| Priority date | — |
| Expiry date | May 1, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/1205
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In a method for introducing an authentication print characteristic in a visible image printed on paper, a part of the image is printed with an ink having first and second component dyes. The first component is less fast than the second component in response to an applied activator. The first component is normally masked by the second component but applying an activator stimulates a bleed of the first component beyond the area of the image part to create a predetermined unmasked area of the fluorescent component. The invention extends to paper on which the authentication print characteristic has been printed and to a method of detecting a forged image by analyzing paper to detect such an image bleed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.