Apparatus for testing documents having magnetic properties
US5457382A · kind A · utility
19Cited by
5References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1992 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Dec 16, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/081
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an apparatus for testing test objects equipped with magnetic properties, the magnetic circuit with an air gap having a detector consists of at least a soft-magnetic material and a permanent-magnetic material, whereby the static magnetic field produced by the permanent-magnetic material penetrates the magnetic circuit. The air gap is preferably formed between an end of the soft-magnetic material and a pole of the permanent-magnetic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.