US Patent 9919849 Closure for a beverage cup

A closure for a beverage cup. The closure comprises a lid having a drinking opening and a rotatable member in rotatable engagement with the lid. The rotatable member swivels laterally of the lid between an open and a closed position. The rotatable member being adapted to close the opening in the lid when the rotatable member is in a closed position. The closure also comprises a vent in the lid that vents into a void under the rotatable member. When the rotatable member is in the closed position the void is sealed to an outside of the closure and when the rotatable member is in the open position the void is open to the outside.