Coin discriminators
US7584833B2 · kind B2 · utility
17Cited by
31References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 8, 2004 |
| Grant date | Sep 8, 2009 |
| Priority date | — |
| Expiry date | Apr 7, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D5/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A coin discriminator measures both the surface and average electrical conductivity of coins in order to distinguish genuine minted coins from fake or bogus coins such as cast coins which may be nominally of the same material as a minted coin. The conductivities are measured using a coil to induce eddy currents within the coin. The high frequency components of the eddy current are monitored to measure the surface conductivity. The low frequency components are measured to monitor the bulk or average conductivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.