Patent ID: 8807386

Claim:
An accessory for a drinking vessel, said accessory comprising: a body having a first wall and a second wall which are opposite to each other, at least one passageway formed therebetween for allowing air or liquid to pass therethrough, a first valve disposed in said passageway, wherein said first valve includes at least one first valve member and a second valve member, arranged such that at least a part of the first valve member overlaps at least a part of the second valve member, said first valve member being integrally formed with said first and second walls, and extending radially therefrom to at least partially block said passageway, said second valve member being integrally formed with said first and second walls, and extending radially therefrom to at least partially block said passageway, each of said first and second valve members including, respectively, an upper surface and a lower surface which are opposite to each other, wherein said upper surfaces of said first and second valve members face generally an outlet from said passageway, wherein said lower surfaces of said first and second valve members face generally an inlet to said passageway which is opposite to said outlet, and wherein said first valve member is deformable, said first valve to the passageway from a closed configuration in which at least part of said lower surface of said first valve member contacts and overlaps at least part of said upper surface of said second valve member to completely block the at least one passageway and prevent flow of air or liquid through said first valve into an open configuration in which said first valve member is displaced away by a suction force from said second valve member to form a channel between the part of the lower surface of the first valve member which is curved away from and out of contact with the part of the upper surface of the second valve member to allow air or liquid to flow through said channel to said outlet, said first valve member being biased towards said closed configuration.