초록 ▼

A time-temperature indicator having a time-temperature sensitive component including a layer of material which at temperatures above a predetermined transition temperature changes from an impermeable, psuedo-crystalline state to a permeable, liquid-crystalline state. A reactant material having a pre

A time-temperature indicator having a time-temperature sensitive component including a layer of material which at temperatures above a predetermined transition temperature changes from an impermeable, psuedo-crystalline state to a permeable, liquid-crystalline state. A reactant material having a predetermined rate of diffusion through the layer at temperatures above its transition temperature is maintained out of contact with an indicator by the layer at temperatures below the transition temperature. A container for the time-temperature component includes a transparent face for viewing the time-temperature component. The container is adapted for attachment to an object, such as to the package of a time and temperature sensitive product to visually indicate the product has been exposed above a particular temperature far in excess of a certain period of time.

대표청구항 ▼

A time-temperature indicating device for indicating deterioration of perishable goods and the like, said device comprising: a time-temperature sensitive component including a reactant material and an indicator responsive to contact by said reactant to produce a visible reaction, said reactant and in

A time-temperature indicating device for indicating deterioration of perishable goods and the like, said device comprising: a time-temperature sensitive component including a reactant material and an indicator responsive to contact by said reactant to produce a visible reaction, said reactant and indicator being normally separated by a diffusion layer having an impermeable, pseudo-crystalline state and a reactant permeable, liquidcrystalline state, said diffusion layer effecting the transition between said impermeable and permeable states at a clearly defined transition temperature; and container means for enclosing said time-temperature sensitive component, said container means including a transparent face for viewing said time-temperature component.