System for optically examining plastic card surfaces
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United States of America Patent
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-
Jun 5, 2001
Grant Date -
N/A
app pub date -
Jul 16, 1999
filing date -
Sep 9, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the optical examination of plastic cards, the latter are illuminated with focused light, which is mixed with a diffuse component, in order reliably to discriminate even relatively slight differences in the reflectivity of the surface sections.
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