초록 ▼

The temperature history of a product is visually displayed as a color front on an indicator, the distance of front advancement being a function of the temperature time integral. The indicator measures the gas generation in a first compartment by a wick in a second compartment, the wick also being in

The temperature history of a product is visually displayed as a color front on an indicator, the distance of front advancement being a function of the temperature time integral. The indicator measures the gas generation in a first compartment by a wick in a second compartment, the wick also being in communication with the first compartment. Optionally, a gas permeable film separates the gas generating material and the wick. The indicator is fine tuned for time temperature integral by incorporating into the wick a quantifier with which the gas generated reacts preferentially.

대표청구항 ▼

A temperature time integrating indicator device which comprises: a. an elongated envelope having generally co-extensive upper and lower walls each of a gas impermeable material, the walls being sealed together in a continuous course extending about the periphery of each, a first longitudinal portion

A temperature time integrating indicator device which comprises: a. an elongated envelope having generally co-extensive upper and lower walls each of a gas impermeable material, the walls being sealed together in a continuous course extending about the periphery of each, a first longitudinal portion of said envelope comprising a gas generation section within said envelope and a second longitudinal portion of said envelope comprising an indicating section within said envelope; b. a gas generating material disposed in the gas generation section of said envelope; c. an elongated wick disposed longitudinally of the envelope with one end thereof in said gas generation section, said wick extending a distance along said envelope indicating section and the other end thereof being remote from said gas generating section; d. a rate controlling film separating said wick from the gas generating material; e. an indicator composition deposited on said wick, said indicator composition producing a color change in the presence of gas generated by said gas generating material; and f. a quantifier incorporated into the indicator composition.