Method for detecting physical anomalies of U.S. currency
US4429991A · kind A · utility
28Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1981 |
| Grant date | Feb 7, 1984 |
| Priority date | — |
| Expiry date | Aug 17, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/183
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Means and methods are provided for examining bills and detecting flaws therein, such as length and width variations, holes, tears and dog-ears or folded corners. Electrical signals are generated by light sensing circuits and compared with signals representing the standard physical characteristics of the bill to indicate deviations therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.