Chemically reactive security ink, a method of use of such ink, and security documents incorporating such ink
US8622436B2 · kind B2 · utility
2Cited by
7References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 2007 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Jan 5, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24802
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A document uses a chemically reactive security ink to facilitate security, making it more difficult to alter a genuine security document. The chemically reactive security ink masks a warning word or message on a security document. The hidden warning word or message is revealed when the document is subjected to chemical washing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.