Time temperature indicator label
US11398167B2 · kind B2 · utility
1Cited by
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22Claims
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Assignee
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Key dates
| Filing date | Jul 11, 2017 |
| Grant date | Jul 26, 2022 |
| Priority date | — |
| Expiry date | Apr 20, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F13/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A time-temperature integrating (TTi) indicator label comprises an initiator reservoir and a target reservoir, said initiator reservoir containing a pH modification system and said target reservoir comprising a pH responsive indicator. The pH responsive indicator may be photo-initiated. There is also provided a time-temperature indicator label comprising first and second reservoirs separated by a hydrogel valve, said valve allowing passage of an acid from said first reservoir to said second reservoir when the hydrogel valve is activated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.