Patent ID: 6874648

Claim:
A self-sealing, molded plastic closure assembly for application to a container for a pressurized or gas-sensitive product, said assembly comprising a closure, the container having a rim that defines an opening, said closure comprising: a top panel that is adapted to span the opening of the container; an annular skirt depending from the top panel and being adapted to secure the closure assembly to a finish of the container, the finish being below the rim; and an annular seating fin extending inwardly and downwardly from an interior of the closure and being formed integrally with the top panel and the annular wall of the closure, the sealing fin being adapted to engage a the rim of a the container to be folded into sealing engagement with the rim and a side of the finish of the container when the closure assembly is secured to the container; said closure assembly further comprising: a barrier disc inserted in said closure and positioned beneath an underside of the top panel of the closure and adapted to be out of sealing engagement with the rim of the container, the barrier disc being adapted to span the entirety of the opening defined by the rim of the container and to be retained within the closure assembly against the underside of the top panel solely by a folded back free end of the sealing fin when the sealing fin is in engagement with the rim of the container.