Monitoring of covert marks
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Aug 8, 2000
Grant Date -
N/A
app pub date -
Jul 2, 1997
filing date -
Aug 3, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for monitoring a body having a reflective surface (1), a coating layer (2) of material transparent to visible light present on the surface (1) and producing a covert optical discontinuity in an imagewise distribution on the layer (2); the imagewise distribution is such that it is visible via polarized light (7) and viewing through a polarized filter (8).
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