Expiration warning patch for gas expiration date management

Details Expiration warning patch for gas expiration date management Expiration warning patch for gas expiration date management

F - Mech Eng,Light,Heat,Weapons

17

C

F17C 13/02 (2006.01) A61J 1/18 (2006.01) G04F 1/00 (2006.01)

Patent

CA 2547049

Embodiments of the invention provide devices and methods for determining the state of content contained within a vessel. Embodiments of the invention provide passive status indicators which change state relative to the lifetime of the content contained within the vessel. In one embodiment the status indicator may be a layered adhesive structure attached to the vessel which changes visibly over time relative to the lifetime of the fluid contained within the vessel. For example, the layered structure may change its color with time. In another embodiment, the status indicator may be an electronic timer attached to the vessel and to at least one of a plurality of indicators. The electronic timer may be configured to notify the user or users of the compressed fluid of the age of the compressed gas via the indicators.

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