Security paper
US4897300A · kind A · utility
35Cited by
6References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1988 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Aug 4, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2933
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention relates to a security paper having a security thread embedded therein, running from edge to edge, that is printed with luminescent colors in such a way that they are invisible in normal lighting. The luminescent colors are provided along the security thread in successive overlapping portions which, when the colors are excited, have a length recognizable to the naked eye and show characteristic mixed fluorescences in the overlapping areas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.