Patent ID: 8684201

Claim:
A vent system for drinking containers having a dispensing device and a collar coupling the dispensing device to the container, the vent system, comprising: a substantially rigid disc portion having a substantially planar lower surface and a plurality of disc liquid openings comprising descending members; a base portion formed of flexible material including a plurality of base vent grooves recessed in said base portion and extending between the periphery of said base portion and a single, integral uni-directional valve that, in an open position, allows air to enter the drinking container and, in a closed position, prevents liquid flowing out of the container into said base vent grooves, and further including a plurality of base liquid openings complementary to said descending members of said disk liquid openings; and wherein said descending members of said disc portion are received in and seal against a surface of said base liquid openings of said base portion and said disc portion and said base portion define air vent channels between said planar lower surface of the disc portion and said base vent grooves, leading from air vent openings in the exterior of said vent system and merging into said valve, allowing air to enter the container through said air vent channels and said valve.