Permanent staining of varnished security documents
US10391806B2 · kind B2 · utility
2Cited by
3References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2013 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | Jun 27, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24917
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The disclosure relates to the field of the protection of security documents, especially banknotes, against illegal actions such as robbery or theft. In particular, the present disclosure relates to the field of ink-stained documents that are resistant to chemicals. The disclosed security documents are covered on at least one side by from about 70% to about 90% of a protective varnish and have from about 10% to about 30% of one or more varnish-free areas with one or more varnish-free indentations, the percentages being based on the total surface of the one side of the security document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.