Signals and indicators – Indicators – Chemically activated type
Patent
1984-07-23
1987-02-17
Terapane, John F.
Signals and indicators
Indicators
Chemically activated type
2524081, 252963, 436 41, G01D 2100, G01N 3100, G01N 3318
Patent
active
046431225
ABSTRACT:
A diffusion-controlled security tag comprising a carrier containing a solution of a compound which changes color upon diffusion or evaporation of the solvent. Preferably the carrier is enveloped in a barrier film which controls the rate of diffusion/evaporation of the solvent from the carrier such that a change in the color of the carrier indicates undesirable storage or product tampering.
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Kilby Catherine S.
Terapane John F.
Wright State University
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