A device for detecting isotopes includes an isotope portion including a material including an isotope of an element, a reaction control portion to cause a chemical reaction of the material, and an electrical parameter portion to measure a change in an electrical parameter of the material, where the change in the electrical parameter is caused by the chemical reaction, and where the change in the electrical parameter is dependent on the isotope in the material, to detect the isotope by comparing the change in the electrical parameter of the material with a known electrical parameter associated with a known isotope.

A device for detecting isotopes includes an isotope portion including a material including an isotope of an element, a reaction control portion to cause a chemical reaction of the material, and an electrical parameter portion to measure a change in an electrical parameter of the material, where the change in the electrical parameter is caused by the chemical reaction, and where the change in the electrical parameter is dependent on the isotope in the material, to detect the isotope by comparing the change in the electrical parameter of the material with a known electrical parameter associated with a known isotope.

This invention relates to thin indicating devices, such as time-temperature indicators and a method of making by applying and UV curing one or more layers of indicating composition are disclosed. For example, an indicator layer is applied on substrate and cured with UV light, immediately followed by an application of an activator layer which is cured by UV light. The device can have other layers, such as a permeable barrier between the activator and indicator layer and a top protective layers which are also UV cured. This fast curing method prevents premature reactions, e.g., diffusion of activator into indicator layer and vice versa during manufacturing.

This invention relates to thin indicating devices, such as time-temperature indicators and a method of making by applying and UV curing one or more layers of indicating composition are disclosed. For example, an indicator layer is applied on substrate and cured with UV light, immediately followed by an application of an activator layer which is cured by UV light. The device can have other layers, such as a permeable barrier between the activator and indicator layer and a top protective layers which are also UV cured. This fast curing method prevents premature reactions, e.g., diffusion of activator into indicator layer and vice versa during manufacturing.

Systems and methods are presented for a timing device. The timing device includes a first electrode, a second electrode, and an electrolyte. The electrolyte includes a material selected such that an electrodeposit forms on the first electrode when a current is applied between the first electrode and the second electrode. A measurable electrical characteristic of the timing device is indicative of a time-dependent degree of growth of the electrodeposit between the first electrode and the second electrode.

Systems and methods are presented for a timing device. The timing device includes a first electrode, a second electrode, and an electrolyte. The electrolyte includes a material selected such that an electrodeposit forms on the first electrode when a current is applied between the first electrode and the second electrode. A measurable electrical characteristic of the timing device is indicative of a time-dependent degree of growth of the electrodeposit between the first electrode and the second electrode.

A single use disposable elapsed time indicator and methods for using same include an indicator that can have a flexible chamber for holding an aqueous medium and a slot with a viewing window and a longitudinal axis. The slot is connected to the chamber via a passage having a breakable seal therein. An absorbable material is located within and at a first end of the slot that swells upon exposure to the aqueous medium. A graded scale is also included along the longitudinal axis of the slot to indicate periods of elapsed time. The absorbable material is configured to expand from the first end of the slot toward an opposing end of the slot along the longitudinal axis and thereby mark elapsed time on the graded scale.

A single use disposable elapsed time indicator and methods for using same include an indicator that can have a flexible chamber for holding an aqueous medium and a slot with a viewing window and a longitudinal axis. The slot is connected to the chamber via a passage having a breakable seal therein. An absorbable material is located within and at a first end of the slot that swells upon exposure to the aqueous medium. A graded scale is also included along the longitudinal axis of the slot to indicate periods of elapsed time. The absorbable material is configured to expand from the first end of the slot toward an opposing end of the slot along the longitudinal axis and thereby mark elapsed time on the graded scale.

A single use disposable elapsed time indicator and methods for using same can include an indicator having a chamber and a longitudinal channel for receiving a volatile fluid. A sponge is located and seated in the longitudinal channel and configured to allow evaporation of volatile fluid from within the longitudinal channel to an exterior of the longitudinal channel. A spring is included in the longitudinal channel which presses against an end of the chamber and against a plunger that is seated and moveable in the longitudinal channel along a longitudinal axis thereof. The spring is configured to exert force on and move the plunger from a first end of the chamber toward a second end of the chamber along the longitudinal axis in the longitudinal channel as volatile fluid in the longitudinal channel evaporates through the sponge. The movement of the plunger thereby marks elapsed time along a graded scale.

A single use disposable elapsed time indicator and methods for using same can include an indicator having a chamber and a longitudinal channel for receiving a volatile fluid. A sponge is located and seated in the longitudinal channel and configured to allow evaporation of volatile fluid from within the longitudinal channel to an exterior of the longitudinal channel. A spring is included in the longitudinal channel which presses against an end of the chamber and against a plunger that is seated and moveable in the longitudinal channel along a longitudinal axis thereof. The spring is configured to exert force on and move the plunger from a first end of the chamber toward a second end of the chamber along the longitudinal axis in the longitudinal channel as volatile fluid in the longitudinal channel evaporates through the sponge. The movement of the plunger thereby marks elapsed time along a graded scale.