Pigment/fluorescence threshold mixing method for printing photocopy-proof document
US5271645A · kind A · utility
23Cited by
9References
7Claims
0Family size
Inventor
Key dates
| Filing date | Oct 4, 1991 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Oct 4, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/902
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Commercially available pigments mixed with fluorescence compound to obtain print stuff mixtures for transfer thereafter to mattes. The print stuff mixtures obtainable thereby are used to print securitY and face-value documents which will be color copier resistant, that is, not be accurately reproducible or replicable by a photocopier. An empirical test is provided which will allow the ordinary skilled printer to determine the best titer of commercially available fluorescence to be used in the ink/pigment mixing scheme.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.