Disposable drinking cup lid

Claim 1

A disposable drinking cup lid for snap fitting on an upper edge of a disposable drinking cup, comprising in combination, a circular shaped member formed from sheet plastic, a peripheral groove on an underside of said member, and a pair of radially extending score lines starting at a peripheral edge of said member and extending to a point that is short of a center of said member so that inners ends of said scores lines are spaced apart, said score lines defining a tab therebetween when torn along said score lines and a pair of expandable corrugations formed in said member in parallel relationship with each other, and extending transversely across the entire width of the tab between the score lines in a substantially circumferential direction, whereby when the tab is torn along the score lines the tab can be radially moved by expanding and contacting of the corrugations to facilitate seating of the tab over the upper edge of the cup to close the cup, and wherein the corrugations continue across the score lines onto the adjacent circular shaped member.