The timing device is a lifetime monitor for indicating when the usable lifetime of a product has ended or for indicating the timing for regular usage of a product. The timing device has a timing initiator, a power supply in the form of a membrane zinc air battery and a visual or audible indicator. The timing initiator is a tear-off air blocking membrane which lets in air when the tear off film is removed. The timing device is capable of indicating a predetermined passage of time which is substantially independent of ambient temperature.

A time validation indicator is disclosed comprising at least a receiving layer and an activating layer. The receiving layer comprises at least one or more masking colorants and one or more deactivators that cause and maintain the one or more masking colorants in an initial colored state. The activating layer comprises at least one or more migratory activators that migrate into the receiving layer upon at least a portion of the receiving layer being placed in contact with at least a portion of the activating layer to initiate a predetermined time period. The migration of the one or more migratory activators into the receiving layer causes at least a portion of the one or more masking colorants to advance to a final colorless state resulting in a visual color change of the receiving layer that indicates the predetermined time period has elapsed. Also disclosed are methods for creating and using the inventive time validation indicator.

A time validation indicator is disclosed comprising at least a receiving layer and an activating layer. The receiving layer comprises at least one or more masking colorants and one or more deactivators that cause and maintain the one or more masking colorants in an initial colored state. The activating layer comprises at least one or more migratory activators that migrate into the receiving layer upon at least a portion of the receiving layer being placed in contact with at least a portion of the activating layer to initiate a predetermined time period. The migration of the one or more migratory activators into the receiving layer causes at least a portion of the one or more masking colorants to advance to a final colorless state resulting in a visual color change of the receiving layer that indicates the predetermined time period has elapsed. Also disclosed are methods for creating and using the inventive time validation indicator.

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.