Patent ID: 6938794

Claim:
A closure for a liquid container comprising: a base component including; a skirt configured for engagement about the mouth of the liquid container; a closure portion connected to said skirt and covering the mouth of the container when the skirt is engaged thereon, said closure portion defining a number of openings for the passage of the liquid therethrough; and a valve element supported by said closure portion, said valve element defining an undercut sealing surface; and a cap component including; a body defining a surface configured for contact by the lips of a consumer drinking the liquid; a sealing element connected to said body and configured to contact said undercut sealing surface in a substantially leak-proof engagement, whereby flow from said number of openings is controlled by said substantially leak-proof engagement; and a resiliently deformable seal directly connected at one end to said sealing element and disposed about said closure portion of said base component, said seal having a first sealing rim at an end opposite said one end in continuous substantially fluid-tight contact with said closure portion of said base component, whereby said resiliently deformable seal supports said cap member on said base member so that said cap member can be depressed by contact with surface of said body to move said sealing element apart from said valve element to expose said number of openings in said closure portion for liquid flow therefrom.