Patent ID: 6991123

Claim:
A closure suitable for mounting onto a container having an opening defined by an end portion of the container, said end portion having an outer surface, an inner surface and a free end, the closure including: a top portion; a skirt portion depending from the top portion; and an annular sealing rib projecting downwardly from an underside of the top portion, the rib including: a first portion which is contiguous with the top portion and has an inner surface, which inner surface lies radially inwardly of the skirt portion; a second, frusto-conical, portion contiguous with the first portion and separated from the top portion by the inner surface of the first portion, the second portion having an upper surface and a lower surface and extending radially inwardly to terminate in a circular edge; and a third portion, having an inner surface and an outer surface, and connected to the second portion at or adjacent the circular edge, the third portion, prior to mounting of the closure to said end portion, extends generally in a direction away from the top portion with the outer surface disposed at an angle to the lower surface of the second portion, and being substantially no thicker than the second portion, and having a length longer than its thickness; wherein the first portion has an internal diameter relative to the external diameter of the end portion of the container such that during attachment of the closure with the end portion of the container, the second frusto-conical portion of the sealing rib will be engaged by said end portion of the container with the upper surface of the second portion folded back towards and at least adjacent the inner surface of the first portion of the rib; and further wherein said length of the third portion is such that on attachment said third portion is positioned between the end portion of the container and the top portion of the closure and wraps around the free end of the end portion from a first position on the outer surface of the end portion to at least the apex of the free end.