Patent ID: 7318536

Claim:
A liquid container comprising a cup including a brim, a floor, and a side wall extending from the brim toward the floor, the side wall including a radially inwardly facing first annular seal surface, the brim including a radially inwardly facing second annular seal surface, an axially upwardly facing third annular seal surface, and a radially outwardly facing fourth annular seal surface, and a downwardly opening channel between the second annular seal surface and the fourth annular seal surface, and a lid including a closure and a fluted closure mount ring appended to the closure and coupled to the brim to retain the closure in a position closing a mouth opening into a liquid reservoir chamber formed in the cup, the fluted closure mount ring including a first seal ring arranged to engage the radially inwardly facing first annular seal surface to establish a first liquid flow barrier therebetween, a second seal ring arranged to engage the radially inwardly facing second annular seal surface to establish a second liquid flow barrier therebetween, a third seal ring arranged to engage the axially upwardly facing third annular seal surface to establish a third liquid flow barrier therebetween, and a fourth seal ring arranged to engage the radially outwardly facing fourth annular seal surface to establish a fourth liquid flow barrier therebetween, wherein the fluted closure mount ring further includes a lid-removal flange located below the fourth seal ring and arranged to extend downwardly in an inner direction toward the floor of the cup, a lid-removal blocker wall located between the fourth seal ring and the lid-removal flange and arranged to engage a terminal end of the brim during movement of the lid in an outer direction opposite to the inner direction, the lid-removal flange is formed to include a series of circumferentially spaced-apart, radially outwardly projecting protuberances arranged to underlie the lid-removal blocker wall, and each protuberance of the fluted closure mount ring is formed to include a radially inwardly opening groove facing toward the side wall of the cup.