Motion sensor for flat objects
US6722781B2 · kind B2 · utility
2Cited by
12References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2002 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Jul 10, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/1912
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A simple method and apparatus for contactless rapid and inexpensive motion checking of flat objects, preferably of currency papers. The objects need not be identical in size, thickness, surface appearance, configuration nor deterioration. The checking is carried out by detecting of airflow oscillation under unexpected stoppage of testing object or air movement around the object especially on its front and back edges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.