G - Physics – 01 – N
Patent
G - Physics
01
N
150/19
G01N 21/29 (2006.01) G01K 3/04 (2006.01)
Patent
CA 1121255
ABSTRACT VAPOR PERMEATION TIME-TEMPERATURE INDICATOR A time-temperature indicator (t-T indicator) is described which is useful for monitoring the shelf lives of various perishable articles. The device is constructed of a vapor-permeable barrier positioned between a vapor and an indicator, both housed in a vapor-impermeable con- tainer. The device is activated just prior to the monitoring period by providing vapor to the container, as for example, by rupturing a solvent-filled frangible reservoir. The indicator, upon contact with the vapor produces a visual color response, and the vapor is constrained to permeate through the vapor-permeable barrier before contacting the indicator, thus creating a characteristic induction period before a color response occurs. The time required for the color response to occur in the device is a function of the temperature and time. The induction period can be varied by the thickness and type of material of construction used for the ~ ~ vapor-permeable barrier, the nature of the vapor and the nature of the indicator employed.
328788
Allied Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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