Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1990-04-06
1992-03-10
McGraw, Vincent P.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250341, 359359, 356 71, G01N 2135, G06K 710
Patent
active
050952102
ABSTRACT:
A multilayer film indicator, mechanism and process for using the indicator for determining the integrity, authenticity, or conformance of an item to an original state, involving the measurement and comparison of the condition of the indicator to an identifiable original quality of the indicator. The identifiable original quality of the indicator is produced by the optical interactions of layers of diverse thermoplastic materials within a laminate of the indicator and is not readily visible to the naked eye.
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Schrenk Walter J.
Wheatley John A.
McGraw Vincent P.
The Dow Chemical Company
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