US Patent 7591389 Drinking cup lid with self-securing sliding member

A disposable lid for a drinking cup includes a cover portion and a sliding member that is configured to slidably fit into a trench in the cover portion. The trench includes a drink opening on a floor of the trench and the sliding member is configured to cover and uncover the drink opening. In one embodiment, the sliding member includes side portions that extend longitudinally and upwardly from a central portion of the sliding member such that an outer edge of each side portion is located above the central portion of the sliding member. A gap width between the outer edges of the side portions of the sliding member is greater than a width of a mouth of the trench such that the side portions of the sliding member secure the siding member to the cover portion.