Patent ID: 8104611

Claim:
A mixing container comprising: an outer vessel having a bottom, an open mouth and a peripheral sidewall between the open mouth and the bottom; an inner vessel having an end, an open mouth and a peripheral sidewall between the end and the open mouth; a seal; and a closure positionable to close the open mouth of the outer vessel and form an exterior seal between the closure and open mouth of the outer vessel, the closure being attached to the end of the inner vessel, the closure and inner vessel being rigidly fixed to one another; wherein the open mouth of the inner vessel is biased against a portion of the seal that is disposed between the open mouth of the inner vessel and the bottom of the outer vessel to effectuate an interior seal between the inner and outer vessels when the closure is positioned to close the open mouth of the outer vessel; and wherein breaking of the exterior seal between the closure and the open mouth of the outer vessel breaks the interior seal between the inner and outer vessels.