Patent ID: 8640902

Claim:
A vent system for a drinking container, the vent system comprising: a single member closure member adapted and configured for mounting between an open top of the drinking container and a liquid outlet member, said closure member including: an integrally formed tubular connecting element; at least one air vent tube, extending from the periphery of said closure member to said connecting element and having at least one air vent tube opening in said periphery; an air passage therethrough defined by the connecting element, said air vent tube and said at least one air vent tube opening, to allow the passage of air from outside the container to an interior of the container when a vacuum is formed inside the container; and a one-way valve sealingly and removably coupled to said connecting element and operatively connected to said air passage, and extending into said container, for permitting passage of air from outside the container into said interior of the container through said more than one air vent tube opening, said air vent tube, said connecting element and said valve, only when a vacuum is formed inside the container and preventing flow of liquid from the interior of the container to outside the container through said vent system.