Time-temperature history indicators

Details Time-temperature history indicators Time-temperature history indicators

G - Physics

01

N

150/26

G01N 31/22 (2006.01) G01N 33/02 (2006.01)

Patent

CA 1062135

INVENTION: TIME-TEMPERATURE HISTORY INDICATORS INVENTORS: G. N. PATEL, ANTHONY F . PREZIOSI and RAY H. BAUGHMAN ABSTRACT OF THE DISCLOSURE Compositions containing at least two conjugated acetylene groups (-C?C-C?C-) are suitable as integral time-temperature history indicators. These compositions exhibit sequences of irreversible color changes at combinations of times and temperatures specific to each composition. Thus, when supported on the surface of a product or on a substrate affixed to a product, they are useful for indicating whether a perishable (e.g., foodstuff, pharmaceu- tical, chemical, etc.) has been exposed to an undesirable time- temperature history that results in substantial degradation of the perishable or whether a product has been exposed to a desirable time-temperature history during processing (e.g., the sterili- zation of a foodstuff or biomedical material).

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