Patent ID: 6254969
Filing Date: 2001-07-03
Classification: B65D,G01N,Y10T

Abstract:
A shelf life indicator for indicating shelf life of a product, the indicator comprising:a structural first layer including an oxygen sensitive ink for providing a visible indication when exposed to a predetermined minimum quantity of oxygen,a second layer including an oxygen scavenging material that prevents oxygen from reaching the oxygen sensitive ink while the oxygen scavenging capability of the oxygen scavenging material is substantially not exhausted, the second layer becoming unable to prevent the predetermined quantity of oxygen from reaching the ink after the oxygen scavenging material is substantially exhausted, anda removable, metallic foil, oxygen-impermeable layer, whereby removal of the oxygen-impermeable layer may initiate the shelf life indicator,whereby the ink provides the visible indication substantially after the oxygen scavenging capability is substantially exhausted to provide a shelf life indication.