Volumetric displacement dispenser

A volumetric displacement dispenser for dispensing liquid contents from an interior of a bottle with a bottle neck while preventing air from filling a void created within the interior of the bottle caused by the liquid contents being poured out of the bottle by gravity, the displacement dispenser comprising:

• a stopper having first and second boreholes extending there through, the stopper being adapted to form an air-tight seal when it is seated into the bottle neck;
• an air pressure tube routed through the first of the boreholes, the pressure tube having a first end and a second end and with the first end open to atmospheric air, and the second end open to and extending into the interior of the bottle;
• an expandable volumetric displacement balloon attached to the second end of the air pressure tube;
• a pouring spout in the second of the boreholes, said pouring spout having a one-way liquid valve disposed therein for preventing atmospheric air from entering the interior of the bottle through the second of the boreholes;
• and
• further including an elongated casing disposed within the expandable balloon, the elongated casing being attached to the second end of the air pressure tube so that the expandable balloon can be inserted into the bottle when the stopper is seated into the bottle neck;
• and
• wherein the elongated casing has a slot extending along its length to and into which the expandable balloon is tucked into the casing after being folded so that the balloon can expand out into the interior of the bottle when atmospheric air is drawn through the air pressure tube into the balloon.