0231499-A1 is referenced by 13 patents and cites 6 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. Optionally, 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
EP19860117561 19861217
Publication Number
0231499 (A1)
Application Date
December 17, 1986
Publication Date
August 12, 1987
Inventor
Bhattacharjee Himangshu Ranjan
US
Assignee
Allied
US
IPC
G01K 03/04
G01N 31/22
G01K 03/00
G01N 21/77
G01N 31/22
G01K 03/04
G01N 21/78
View Original Source Download PDF