Method and apparatus for monetary articles authentification
US4086527A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1976 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | Mar 24, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D5/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An authentication method for standardized objects, such as in particular monetary articles, in which an object to be authenticated is introduced into the field located between an emitter and a receiver delivering at least an alternative physical quantity, whose quantitative alteration produced by the presence of said object in said field is measured, the result being compared with a reference value pre-stored in a memory and distinctive of the object to authenticate, whereby, within a tolerance approximation, an authentication criterion is deducted, method characterized by the fact that said alteration is measured at different frequencies, that corresponding alterations are successively measured and then simultaneously compared with said respective reference quantities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.