Disclosed herein are delayed reaction threshold temperature indicators and methods of making and activating the same, the delayed reaction threshold temperature indicators including a first substrate, first and second layers, and a housing secured to the substrate. The first layer includes a first reactant and an optional meltable polymer, and the second layer includes a meltable polymer and a second reactant. The meltable polymer is configured to keep the first and second reactants from interacting with each other. When exposed to temperatures at and/or above a desired threshold for a period of time, the meltable polymer melts and allows the first and second reactants to come into contact with each other, thereby producing a visual change in appearance.

An activatable print medium is disclosed. The print medium includes a first reactive component, a second reactive component, wherein the first and second reactive components are configured to react to initiate a state change of the activatable print medium when exposed to each other and a barrier that is initially in an unactivated form and configured to transition to an activated form when activated by an application of at least one of an activation heat and an activation pressure wherein after the barrier is activated, but not before, the activatable print medium is configured so that the first and second reactive components interact in response to a predetermined environmental stimulus or interact over time at a rate dependent on an environmental stimulus, thereby providing an indication of the cumulative historical exposure of the activatable print medium to the environmental stimulus.

The present invention relates to a visual time-temperature indicator which comprises a first and a second element each comprising a hydrogel, wherein said first element further comprises at least one alkalinizing agent, and said second element comprising further at least one food colouring.

A visually sensible indicator of temperature including electronic temperature sensing circuitry sensing at least when a temperature exceeds at least one predetermined temperature threshold and providing at least one corresponding threshold exceedance output which is sensible as heat and a heat-responsive visually sensible display which is responsive to the at least one threshold exceedance output for providing at least one visually sensible indication indicating that the temperature has exceeded the predetermined temperature threshold.

A self-supporting film (10) comprises a gas barrier layer (20); a semi-permeable layer (40); and an indicator material (30), preferably a colorimetric indicator material, is provided between the gas barrier layer (20) and the semi-permeable layer (40). The indicator material (30) is in direct contact with the gas barrier layer (20). The film (10) is particularly useful as an item of packaging, particularly in packaging for perishable materials.

An object of the present invention is to provide a temperature sensing material that changes a color density continuously with the lapse of time at a temperature not lower or higher than a predetermined temperature and a temperature deviation time estimating system using it. In order to achieve the above object, the temperature sensing material according to the present invention is a temperature sensing material having a structure of dispersing a temperature indicating material that changes color by crystallization in a dispersion medium and is characterized in that an average particle size of the temperature indicating material is not larger than a resolution when observed and a volume fraction of the temperature indicating material to the temperature sensing material is not less than 5% to less than 90%.

An IV set includes an IV component and a duration monitor device coupled to the IV component. The duration monitor device may include an indicator portion configured to change color after a determined amount of time upon activation of the indicator portion, or an RFID tag configured to be detected by an RFID reader. The duration monitor is configured to provide an indication of passage of a useful-life time period for the IV set or the IV component. Methods of operating a duration monitor device are also provided.

The present invention relates to time temperature indicator (TTI) systems for monitoring the time and temperature exposure of foods, nutraceuticals, pharmaceuticals, chemicals and similar products. More particularly, the present invention provides a cap system, such as a screw cap system, featuring a TTI system.

A device is presented for use in controlling the quality of a perishable object, while progressing on its supply line, by monitoring the condition of a time-temperature indicator (TTI) associated with the object. The device comprises a sensing assembly for detecting a response of the TTI to a predetermined stimulus and generating measured data representative thereof, said measured data being indicative of the condition of the TTI, thereby enabling the determination of the remaining shelf life of the TTI and thereby any perishable good to which it is attached and calibrated.

A thermal history detection label for detecting a thermal history over a temperature range to be monitored while suppressing an increase in label size is provided. The thermal history detection label is configured to detect a thermal history by the permeation of a molten permeating material into a permeation body, and the thermal history detection label includes a permeating material that integrally includes a first permeating material having a first melting point and a second permeating material having a second melting point higher than the first melting point, and a permeation body into which the permeating material permeates.