Tamper evident system
First Claim
1. A tamper evident system for a closed enclosure for indicating when the closed enclosure has been opened, said tamper evident system comprising(a) a see-through membrane provided in the enclosure,(b) a fracturable wall separating the enclosure into first and second compartments, said first compartment containing at least one first gas, said second compartment containing at least one second gas, said fracturable wall being adapted to be fractured to allow said first and second gases to mix and form a composition of gases in the closed enclosure, the composition of gases being changed upon opening of the enclosure, andindicating means located in the enclosure adjacent said see-through membrane and visible from the exterior of the enclosure, said indicating means being sensitive to a change in the composition of gases in the enclosure caused by the opening of the enclosure for giving a visual indication of the change in the composition of gases and thus of the opening of the enclosure.
5 Assignments
0 Petitions
Accused Products
Abstract
A tamper evident system for indicating when a closed enclosure (24) has been opened comprises a window (21) and a sensor (22) colour sensitive to presence of a gas. The sensor (22) is located in the enclosure (24) so as to be visible through the window (21). Any compositional change of gas in the enclosure (24) is signalled by a change of colour of the sensor (22).
77 Citations
19 Claims
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1. A tamper evident system for a closed enclosure for indicating when the closed enclosure has been opened, said tamper evident system comprising
(a) a see-through membrane provided in the enclosure, (b) a fracturable wall separating the enclosure into first and second compartments, said first compartment containing at least one first gas, said second compartment containing at least one second gas, said fracturable wall being adapted to be fractured to allow said first and second gases to mix and form a composition of gases in the closed enclosure, the composition of gases being changed upon opening of the enclosure, and indicating means located in the enclosure adjacent said see-through membrane and visible from the exterior of the enclosure, said indicating means being sensitive to a change in the composition of gases in the enclosure caused by the opening of the enclosure for giving a visual indication of the change in the composition of gases and thus of the opening of the enclosure.
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13. A container characterized by a tamper evident system providing a visual indication of opening of the container, said container comprising
(a) a body member defining an enclosure therein and having an opening into said enclosure, (b) a removable cap member closing said opening in said body member to provide a closed enclosure, said cap member including a see-through membrane therein, (c) a composition of gases in said closed enclosure that is changed upon removal of said cap member or other opening of said enclosure, indicating means located adjacent said see-through membrane and sensitive to a change in the composition of gases within said enclosure upon opening thereof for providing a visual indication that the composition of gases has changed and thus the enclosure has been opened, and (d) a fracturable membrane initially encapsulating said indicating means and being located in position to be fractured by said cap member when said cap member closes the enclosure to expose said indicating means to the enclosure and the composition of gases therein.
Specification