05709472 is referenced by 78 patents and cites 18 patents.

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.

Title
Time-temperature indicator device and method of manufacture
Application Number
8/546919
Publication Number
5709472
Application Date
October 23, 1995
Publication Date
January 20, 1998
Inventor
Stephen C Fields
Mendham
NJ, US
Raymond M Arnold
Harrisonville
NJ, US
Thaddeus Prusik
Stroudsburg
PA, US
Agent
Arthur J Plantamura
Assignee
LifeLines Technology
NJ, US
IPC
G01K 1/14
G01K 13/00
G01K 11/06
G01K 3/04
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