Patent ID: 7975864

Claim:
A closure suitable for attachment to a container having an end portion defining an opening of the container, the closure comprising: a top portion; a skirt portion depending from the top portion, said top portion and skirt portion defining a cavity; a first sealing portion which is at least adjacent the top portion and having an inner surface, said inner surface having a first substantially cylindrical surface portion that is substantially parallel (in cross-section) to and lying radially inwardly of the skirt portion and at least one second substantially cylindrical surface portion lying radially inwardly of and parallel (in cross-section) with the first surface portion, said second substantially cylindrical surface portion being spaced from the top portion by the first substantially cylindrical surface portion; and a second sealing portion separated from the top portion by the inner surface of the first sealing portion and having an inner surface and an outer surface with the inner surface tangential to an innermost second substantially cylindrical surface portion of said one or more substantially cylindrical surface portions; wherein said second sealing portion, prior to attachment of the closure to the container, extends at least inwardly into said cavity to a free edge positioned inwardly of the skirt portion, and after attachment of the closure to the container, has been pushed relatively upwardly so that said inner surface of said sealing portion is brought into contact with at least the innermost of said second substantially cylindrical surface portions.