Authenticity sensing
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United States of America Patent
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Jun 7, 1988
Grant Date -
N/A
app pub date -
Jun 9, 1986
filing date -
Jun 7, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for determining whether a test sheet, such as a banknote, is a genuine reproduction of a reference sheet having a magnetic characteristic such as being printed with a ferromagnetic ink. The method comprises sensing for a magnetic effect, such as a magnetic field, with a suitable detector (14) from a plurality of areas (A-D) of the test sheet. The sensed magnetic effects are compared from two different groups (B, D) of one or more of the areas; and the test sheet is classified as unacceptable if the relationship between the magnetic effects of the compared groups is not within limits previously determined as acceptable for the relationship between the magnetic effects of the same pair of groups of areas of the reference sheet.
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