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US 2018/0321159 A1Published application
Dual-function heat indicator and method of manufacture
AssigneeTemptime Corporation
InventorsThaddeus PRUSIK, Dawn E. SMITH, Dene H. TAYLOR, Raquiba Hoque ARNOLD
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Abstract
A dual-function heat indicator for monitoring two or more modes of heat exposure is described. A manufacturing process for the dual-function heat indicator is also described. Dual-function heat indicators as described may be useful for monitoring the exposure of host products, with which the dual-function heat indicators may be associated, to cumulative ambient heat exposure and to a peak ambient heat exposure, and for other purposes.
Claims33
A dual-function heat indicator comprising:
- a substrate;
- a cumulative exposure layer supported by the substrate in a viewable, layered configuration, wherein the cumulative exposure layer is configured to undergo an optical change in appearance in response to a cumulative heat exposure;
- and
- a peak exposure layer supported by the substrate in a viewable, layered configuration, the peak exposure layer comprising a meltable solid configured to melt upon exposure to a predetermined peak heat exposure, the peak exposure layer configured to darken in response to the melting of the meltable solid, the darkening persisting after the meltable solid re-solidifies;
- wherein the cumulative exposure layer and the peak exposure layer are functionally separate with the visual outputs of the cumulative exposure layer and the peak exposure layer integrated in a single overlapping display.
2 more elements
Dependencies are inferred from the claim text.