Security document validation
US6438262B1 · kind B1 · utility
14Cited by
9References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1999 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Apr 14, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/121
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Method and apparatus for validating banknotes. In some countries, genuine banknotes are provided with a security thread embedded in the banknote, but partially exposes at regularly spaced regions along its length by windows. The windows have a width greater that the security strip itself. The increased transmissivity of the banknote in the infrared region is utilized to detect the presence of such windows to validate the banknote. If the required variation in transmissivity is not detected, the banknote can be rejected as a countefeit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.