System for authenticating printed documents
US5974883A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1998 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Feb 13, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system for authenticating bank notes by checking for raised print (37) produced by an intaglio printing process which only occurs on genuine bank notes. Each note (36) is individually transported past a pair of brushes (38) whose bristles are in contact with the two faces of the note. Microphones (28) are placed in close proximity to the brush means to sense the noise from the brush means which increases when there is raised print. Output from the microphones are digitized and applied to a data processing means (22) which determines whether the note contains raised printing, and hence whether the note is genuine or not, by generating a value based on the digitized outputs of the microphones (28) and comparing this value with stored values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.