Combination freeze indicators

Details Combination freeze indicators Combination freeze indicators

2006-11-08

2009-02-17

Smith, R. Alexander (Department: 2841)

Signals and indicators

Indicators

Temperature responsive or compensating means

C116S207000, C374S106000

Reexamination Certificate

active

07490575

ABSTRACT:
A combination temperature exposure indicator suitable for attachment to, or association with, a host product has a substrate, a freeze indicator supported by the substrate and a cumulative ambient time-temperature indicator also supported by the substrate. The freeze indicator can provide a visual indication of exposure of the freeze indicator to a freezing or near-freezing temperature and the cumulative time-temperature indicator can provide a visual indication of exposure of the cumulative time-temperature indicator to a predetermined cumulative time-temperature value. Also disclosed are: a combination freeze indicator and threshold temperature indicator; a combination threshold indicator and cumulative temperature indicator; and three-way combination indicators that can provide indications of cumulative past temperature exposure, exposure to freezing temperatures and exposure to a temperature above a threshold.

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