Time-temperature history indicators

Details Time-temperature history indicators Time-temperature history indicators

1976-02-23

1976-12-28

Reese, Robert M.

Chemistry: physical processes

Physical processes

Crystallization

426 88, G01N 3122

Patent

active

039999467

ABSTRACT:
Compositions containing at least two conjugated acetylene groups (-C.tbd.C-C.tbd.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, pharmaceutical, 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 sterilization of a foodstuff or biomedical material).

REFERENCES:
patent: 3344670 (1967-10-01), Olsen et al.
patent: 3615719 (1971-10-01), Michel et al.
patent: 3768976 (1973-10-01), Hu et al.
patent: 3822134 (1974-07-01), Rasch et al.
patent: 3942467 (1976-03-01), Witonsky

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