Time temperature indicator label
AssigneeIntray Limited
InventorsJohn Robinson, Stephen Wintersgill, Andy Hancock, Martin Peacock, Sarah Akbar, Brunella Maranesi
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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.
Claims22
A time-temperature integrating (TTi) indicator label comprising:
- an initiator reservoir;
- a target reservoir, said initiator reservoir containing a photoinitiated pH modification system and said target reservoir comprising a pH responsive indicator;
- and
- an accumulator reservoir, the initiator reservoir, the target reservoir, and the accumulator reservoir being arranged in series, initiator reservoir to accumulator reservoir to target reservoir, wherein the accumulator reservoir and the target reservoir are separated by a stimuli-responsive hydrogel polymer plug.
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, and further comprising a third reservoir, wherein the third reservoir is separated from the second reservoir by a stimuli-reactive hydrogel plug.
Dependencies are inferred from the claim text.