Critical temperature indicator

Details Critical temperature indicator Critical temperature indicator

2005-10-25

2005-10-25

Bennett, G. Bradley (Department: 2859)

Signals and indicators

Indicators

Temperature responsive or compensating means

C116S206000, C116S207000, C422S051000, C436S164000

Reexamination Certificate

active

06957623

ABSTRACT:
A critical temperature indicator according to the present invention produces a visual, irreversible indication that the indicator has been subjected to a selected critical temperature. The critical temperature indicator includes a transparent housing, and a temperature sensitive transformable material operably contained within the transparent housing which includes mixture of water, nucleating agent (preferably ice nucleating active (INA) microorganisms), latex, and stabilizer which is translucent prior to exposure of a predetermined temperature and is transformed upon being subjected to the predetermined temperature to render a substantially consistent opaque material thus precluding visibility therethrough and thereby providing a sure visual sign that the indicator has been subjected to the predetermined temperature.

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