Patent ID: 8186537

Claim:
A closure for a liquid container comprising: a closure body adapted to engage a liquid container, having an inner surface, an outer surface, a dispensing port extending through the body, and a vent extending through the body adjacent the dispensing port; and a tube extending through the dispensing port having a retaining flange extending laterally therefrom and engaging the outer surface of the body, wherein said tube further comprises a valve located inside the tube, constructed of a resiliently flexible material and said valve spanning the interior of the tube and comprising at least one slit extending there through, and a flexible seal member having a generally frusto-conical shape having an inner end of the flexible seal member located on the tube, spaced away from the inner surface, and an outer end of the flexible seal member spaced away from the tube and engaging the inner surface in a first position, such that the vent extends through the inner surface at a point radially between the tube and the outer end of the flexible seal member, the flexible seal member and the tube defining a hollow area therebetween, and the flexible seal member being movable, in response to a pressure differential across the vent, away from the tube and the inner surface to a second position, to allow the inflow of air through the vent and between the inner surface and the outer end of the flexible seal member, into the liquid container.