04812053 is referenced by 59 patents and cites 17 patents.

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.

Title
Activatable time-temperature indicator
Application Number
815696
Publication Number
4812053
Application Date
August 7, 1987
Publication Date
March 14, 1989
Inventor
Himangshu R Bhattacharjee
Randoph
NJ, US
Agent
Arthur J Plantamura
Assignee
LifeLines Technology
NJ, US
IPC
G01K 3/04
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