Semi-irreversible temperature exposure sensor customizable by thermal printer
US12332121B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2021 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | Nov 10, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2003/0211
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A customizable temperature exposure indicator and methods for making the same are disclosed. The temperature exposure indicator includes a substrate, a printing region of the substrate forming a heat sensitive media that is configured to darken when it is heated by a thermal 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, 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, 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 threshold until it is heated above the high temperature threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.