Security document validation
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United States of America Patent
Stats
-
Aug 20, 2002
Grant Date -
N/A
app pub date -
Apr 14, 1999
filing date -
Feb 5, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and apparatus for validating banknotes. In some countries, genuine banknotes are provided with a security thread embedded in the banknote, but partially exposes at regularly spaced regions along its length by windows. The windows have a width greater that the security strip itself. The increased transmissivity of the banknote in the infrared region is utilized to detect the presence of such windows to validate the banknote. If the required variation in transmissivity is not detected, the banknote can be rejected as a countefeit.
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