Combination freeze indicators
US7490575B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2006 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Nov 8, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K2207/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A combination temperature exposure indicator suitable for attachment to, or association with, a host product has a substrate, a freeze indicator supported by the substrate and a cumulative ambient time-temperature indicator also supported by the substrate. The freeze indicator can provide a visual indication of exposure of the freeze indicator to a freezing or near-freezing temperature and the cumulative time-temperature indicator can provide a visual indication of exposure of the cumulative time-temperature indicator to a predetermined cumulative time-temperature value. Also disclosed are: a combination freeze indicator and threshold temperature indicator; a combination threshold indicator and cumulative temperature indicator; and three-way combination indicators that can provide indications of cumulative past temperature exposure, exposure to freezing temperatures and exposure to a temperature above a threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.