Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Reexamination Certificate
2011-04-12
2011-04-12
Ross, Dana (Department: 3725)
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
C283S072000, C283S074000, C283S094000, C283S099000, C283S107000, C283S109000, C283S901000
Reexamination Certificate
active
07922209
ABSTRACT:
An article bears an HVS-perceivable security pattern based on metamerism. The metamerism causes the security pattern to be perceived differently when viewed under two different light sources.
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Hewlett--Packard Development Company, L.P.
Lewis Justin V
Ross Dana
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