Ink composition for marking and authenticating objects
US5702511A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1996 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Jan 25, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D11/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This aim of the invention is to develop an ink composition comprising at least one non-photochromic pigment or dye, a photochromic pigment or dye and a solvent, the photochromic pigment or dye changing absorption spectrum under the effect of a first light emitting in a wavelength belonging to the ultra-violet range, so that when it is subsequently illuminated by a second light only emitting in a wavelength belonging to the visible range, it has a color different from that which it had, under the illumination of said second light, prior to illumination by said first light, said color also differing from that of the non-photochromic pigment or dye when the latter is illuminated by said second light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.