US 12,332,121 B2
Semi-irreversible temperature exposure sensor customizable by thermal printer
Gene A. Hofer, Lake Zurich, IL (US); Mohannad Abdo, Clifton, NJ (US); Marielle K. Smith, Parlin, NJ (US); and Arianna E. Harding, Cary, IL (US)
Assigned to TEMPTIME CORPORATION, Morris Plains, NJ (US)
Filed by Temptime Corporation, Morris Plains, NJ (US)
Filed on Oct. 11, 2021, as Appl. No. 17/498,371.
Prior Publication US 2023/0114227 A1, Apr. 13, 2023
Int. Cl. G01K 11/12 (2021.01); B41J 2/375 (2006.01); C09D 11/50 (2014.01); G01K 3/04 (2006.01); G01K 11/16 (2021.01); C09D 5/26 (2006.01); G09F 3/02 (2006.01)
CPC G01K 11/12 (2013.01) [B41J 2/375 (2013.01); C09D 11/50 (2013.01); G01K 3/04 (2013.01); G01K 11/16 (2013.01); C09D 5/26 (2013.01); G09F 2003/0211 (2013.01)] 32 Claims
OG exemplary drawing
 
1. A temperature exposure indicator, comprising:
a substrate, a printing region of the substrate forming a heat sensitive direct thermal print media that is configured to darken when it is heated by a direct thermal printer printhead, the darkening being permanent with respect to subsequent cooling of the media;
at least one memory thermochromic composition provided on an indicator region of the substrate,
wherein the thermochromic composition is configured to have high temperature color state when it is heated above a high temperature threshold, and to remain in the high temperature color state until it is cooled below a low temperature threshold,
wherein the thermochromic composition is configured to have a low temperature color state when it is cooled below the low temperature threshold and to maintain the low temperature color state until it is heated above the high temperature threshold.