Patent ID: 8371470

Claim:
A container for dispensing a predetermined volume of liquid wherein when the container is an upright position it comprises: a liquid deposit chamber having a closed top end and an open bottom end; a liquid withdrawal chamber in nested relationship with the liquid deposit chamber having an open top end and a closed bottom end; a detachable base cap that seals the bottom end of the liquid deposit chamber, the cap having a cavity that allows liquid to pass between the liquid deposit and withdrawal chambers; an air flow aperture in the withdrawal chamber for air to flow from the withdrawal chamber into the deposit chamber, and; a liquid flow aperture in the withdrawal chamber for liquid to flow from the deposit chamber into the withdrawal chamber, wherein said air flow aperture is located in a side wall of the withdrawal chamber, wherein when the container is inverted from the upright position to a fill position, the cap can be detached from the deposit chamber so that the deposit chamber can be filled with liquid, wherein after re-attaching the cap, the container is inverted from the fill position to the upright position, air flows from the withdrawal chamber to the deposit chamber and liquid flows from the deposit chamber into the withdrawal chamber until the level of liquid in the withdrawal chamber prevents air flow into the deposit chamber, thereby dispensing a predetermined volume of liquid into the withdrawal chamber.