Apparatus and method for authentication of documents printed wit

Details Apparatus and method for authentication of documents printed wit Apparatus and method for authentication of documents printed wit

1993-08-31

1995-05-23

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

235450, 235449, 194213, 324226, 324228, 209534, G01N 2780, G01N 2784, G07D 700, G06K 708

Patent

active

054184584

ABSTRACT:
A detection system for detecting and/or verifying the magnetic properties of the magnetic ink layer on common printed or copied documents includes, in order of interaction with the magnetic ink of a Document, a saturation record head, a saturation read head, a non-saturation record head, and a non-saturation read head. The disclosed method of operation is equivalent to the normal testing of the magnetic layer of a Document, but eliminates the need for an erase magnet.

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patent: 5196681 (1993-03-01), Mantegazza

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