Method for determining quality of U.S. currency
US4255057A · kind A · utility
32Cited by
3References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1979 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Oct 4, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/12
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An apparatus for detecting quality of currency or the like. Signals representative of the transmissivity and reflectivity of a bill are subtracted from a signal representative of unity. The resulting signal, which is representative of absorptivity of light by the bill, is accumulated over the length of the bill and compared to a reference to produce digital signals representative of fit or unfit bills.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.