Importance

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Abstract

A container closure includes liner adapted to seal a container having contents under vacuum pressure, and a closure member securing the liner thereto about the liner periphery. An interior extent of the liner is thereby permitted movement relative to the closure member, i.e., is not secured to the closure member. At the point of container initial closure, the liner interior extent is withdrawn under vacuum pressure from its theretofore normal self-biased disposition adjacent the closure member to within the upper neck of the container and is deformed to the extent that initial container pressurization occasions. Upon loss of such initial vacuum pressure, the liner interior extent moves into its normal self-biased disposition adjacent the closure member. Discernment of the disposition of the liner interior extent relative to the closure member is thus indicative of whether the initial vacuum pressure is being maintained or has been lost.

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First Claim