Patent ID: 8113374

Claim:
A closure for a container containing a flowable substance, the container having an opening therein for passage of the flowable substance therethrough, the closure comprising: a base adapted to be connected to the container around the opening, the base comprising a skirt, a flange extending inward from the skirt, the flange including a plurality of saw teeth, and a pull tab, the pull tab comprising a center portion, a periphery, and a pull ring, the periphery of the pull tab connected to the flange by a frangible portion, wherein when a user pulls on the pull ring, the frangible portion breaks to allow removal of the center portion of the pull tab to open an aperture through the base; a membrane attached to the bottom of the flange and adapted to be attached to the container to seal the opening, the periphery of the pull tab being further connected to a peripheral portion of the membrane such that the center portion of the pull tab is spaced from a central portion of the membrane to create a pocket between the central portion of the membrane and the center portion of the pull tab, and wherein removal of the pull tab causes the membrane to engage the plurality of saw teeth, assisting in tearing away the central portion of the membrane to unseal the opening of the container; and a cap connected to the base by a hinge, the cap being pivotable about the hinge between an open position, wherein the flowable substance can flow through the opening, and a closed position, wherein the cap obstructs the opening to prevent the flowable substance from flowing through the opening.