INDICATING DEVICES BASED ON LATERAL DIFFUSION OF A MOBILE PHASE THROUGH A NON-POROUS STATIONARY PHASE
First Claim
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1. An indicating device based on lateral diffusion of a mobile phase through a layer of a non-porous stationary phase comprised ofa mobile phase layer;
- and a non-porous, non-adsorbing or non-absorbing stationary phase layer;
wherein the mobile phase laterally diffuses through the stationary phase layer and creates a noticeable or measurable boundary;
wherein the stationary phase layer and the mobile phase layer are sandwiched between two substrates; and
wherein the mobile phase or the stationary phase are either coated on the same or different substrate.
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Abstract
This invention relates to indicating devices, such as time-temperature indicators based on lateral diffusion of a vapor of a solid and/or liquid mobile phase (e.g., a sublimeable dye or an activator) through a non-porous stationary phase, such as a thin layer of a polymeric material. The lateral diffusion of the mobile phase creates a noticeable boundary in the stationary phase whose movement depends upon processes, such as time and temperature.
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Citations
41 Claims
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1. An indicating device based on lateral diffusion of a mobile phase through a layer of a non-porous stationary phase comprised of
a mobile phase layer; - and a non-porous, non-adsorbing or non-absorbing stationary phase layer;
wherein the mobile phase laterally diffuses through the stationary phase layer and creates a noticeable or measurable boundary; wherein the stationary phase layer and the mobile phase layer are sandwiched between two substrates; and wherein the mobile phase or the stationary phase are either coated on the same or different substrate. - View Dependent Claims (2, 3, 8, 9, 10, 11, 13, 14, 15, 19, 21, 22, 24, 27, 28, 31, 33, 35, 37)
- and a non-porous, non-adsorbing or non-absorbing stationary phase layer;
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40. A process of monitoring a change which comprises using an indicating device based on lateral diffusion of a mobile phase through a layer of a non-porous stationary phase to indicate a change in time, temperature, time-temperature, freeze, thaw, heating, cooling, humidity, doneness of food, microwave and sterilization including sterilization with steam, ethylene oxide, a peroxide, plasmas of a peroxide, formaldehyde and dry heat by monitoring a change in the indicating device.
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Specification