Process and apparatus for identifying articles of sheet material by means of microwaves
US4566122A · kind A · utility
2Cited by
7References
28Claims
0Family size
Inventor
Key dates
| Filing date | Apr 8, 1983 |
| Grant date | Jan 21, 1986 |
| Priority date | — |
| Expiry date | Apr 8, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for the identification by microwaves of a sheet article composed of an electrically non-conductive material, the article being marked for identification by the incorporation therein of electrically conductive fibers. The apparatus comprises: at least two microwave emitter devices one adjacent the other; detectors of waves reflected by the article when advanced before said devices; a screen placed in front of at least one of the emitters; and, regulating means for raising the sensitivity of the identification signals by setting the distances between the emitter device, screen and support for the interposed article.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.