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United States of America Patent
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-
Jul 18, 2006
Grant Date -
Jan 13, 2005
app pub date -
Mar 19, 2004
filing date -
Mar 19, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A unique conductivity pattern is applied to printable articles to provide a 'signature' for later verifying the authenticity of the printable articles. Preferably, the conductivity pattern is hidden from sight and differs from other conductivity patterns applied to other printable articles in an effectively random manner. Capacitive sensors read the conductivity patterns, and the resulting data for recording the signatures reflects not only details of the conductivity patterns themselves but also the characteristics of the capacitive sensors and their use.
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