G - Physics – 01 – K
Patent
G - Physics
01
K
354/29, 73/72
G01K 7/00 (2006.01)
Patent
CA 1158063
-15- TIME-TEMPERATURE INDICATOR ABSTRACT This invention relates to time-temperature indication apparatus. The shelf life in many products, including food, drugs, and photographic and X ray film is determined by the ambient temperature to which the product is exposed. Time-temperature indication by chemical means is known; however, such indicators are played over a relatively narrow temperature range or tend to have only two operable states. In any event, they do not accur- ately follow the actual shelf life of such products which tends to be a continuous function of ambient temperature and time. The disclosed invention accomplishes time-temperature indication by generating an electrical current having an amplitude-temperature relationship thus proportional to the reciprocal of the time- temperature relationship characteristic of a substance to be monitored. The current is integrated and an indication is given when the integrated current reaches a predetermined value, to signal a change in the characteristic of the substance being monitored. The disclosed indicator includes a galvanic cell having a cell component that is consumed as electrical current is drawn from the ceil. In effect, the consumable component serves as an integrator of the current drawn from the cell which is made dependent upon temperature by an electrical circuit. The indicator is actuated when a predetermined percentage of the component is consumed.
376799
Karr Lawrence J.
Kaye Stanton
Karr Lawrence J.
Kaye Stanton
Smart & Biggar
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