Thermal measuring and testing – Temperature measurement – Composite temperature-related paramenter
Patent
1987-08-07
1989-03-14
Cuchlinski, Jr., William A.
Thermal measuring and testing
Temperature measurement
Composite temperature-related paramenter
374162, 116206, 426 88, 428913, 252962, 252586, G01K 304
Patent
active
048120537
ABSTRACT:
An activatable time-temperature indicator consists of an oxygen-sensitive reaction product of a triarylmethane dye and a decolorant that is coated on a substrate and covered by an oxygen barrier. Optinally, an oxygen-permeable layer is between the coating and the oxygen barrier. The indicator is activated by removing the oxygen barrier. Following this activation step, a progressive color development occurs at a rate that increases with temperature. The indicator is useful for monitoring the freshness of perishable products, particularly those stored at sub-ambient temperature.
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Cuchlinski Jr. William A.
LifeLines technology, Inc.
Plantamura Arthur J.
Worth W. Morris
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