G - Physics – 08 – B
Patent
G - Physics
08
B
343/17, 354/21
G08B 13/18 (2006.01) G08B 21/00 (2006.01)
Patent
CA 1257921
ABSTRACT OF THE DISCLOSURE ENVIRONMENTAL INDICATOR DEVICE AND METHOD A device for monitoring environmental exposure includes an element whose electrical properties change, in a predetermined way, in response to the environmental exposure. The element may be part of a tuned circuit or of a shield for a tuned circuit. In either case, when the tuned circuit is interrogated, preferably by an r.f. or microwave signal, it emits a signal whose intensity depends on the electrical properties of the element. Thus, an incremental environmental exposure can be measured by a change in the signal intensity. The device is particularly useful for monitoring the condition of perishable materials, because it can be located with the perishable inside a packaging material during both storage and interrogation.
527567
Baughman Ray H.
Eckhardt Helmut
Elsenbaumer Ronald L.
Iqbal Zafar
Miller Granville G.
Gowling Lafleur Henderson Llp
Monsanto Company
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