Thermal measuring and testing – Temperature measurement – Composite temperature-related paramenter
Patent
1997-11-21
2000-03-28
Hirshfeld, Andrew
Thermal measuring and testing
Temperature measurement
Composite temperature-related paramenter
374104, 374160, 374150, 374141, 116219, G01K 304, G01K 1106, G01K 1300, G01K 114
Patent
active
060422645
ABSTRACT:
A time-temperature indicator label for measuring the length of time to which a product has been exposed to a temperature above a pre-determined temperature is provided. The period of time of exposure is integrated with the temperature to which the indicator is exposed. The label is a composite of a plurality of layers adapted to be adhered at its underside to a product container. The label includes a printable surface layer, a longitudinal wicking strip that is adhered underneath the surface layer substantially at the opposite extremities only of the wicking strip and a lower substrate layer forming an envelope with said surface layer. A heat-fusible substance, which melts and flows above a pre-determined temperature, is applied on the surface of the wicking strip contiguous to at least one of the ends of the wicking member. When the heat-fusible substance is exposed to a temperature above the pre-determined temperature, the heat-fusible substance flows along the length of the wicking member. The label has a printable surface layer and is sealed at its peripheral edge to the peripheral edge of the substrate layer. These layers encapsulate the wicking member and the heat-fusible substance. The surface layer is provided with a sight window at an intermediate location over the wicking member through which the progress of flow on the wicking member is observed.
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Arnold Raymond M.
Fields Stephen C.
Prusik Thaddeus
Hirshfeld Andrew
LifeLines technology, Inc.
Plantamura Arthur J.
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