Abstract: A volumetric displacement dispenser and method of using the dispenser is disclosed 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 dispenser includes 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 has a first end open to atmospheric air and a second end open to the interior of the bottle. An expandable volumetric displacement balloon is attached to the second end of the air pressure tube and a one-way liquid valve is disposed in the outlet of the liquid flow channel in the stopper.

Abstract: A volumetric displacement dispenser and method of using the dispenser is disclosed 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 dispenser includes 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 has a first end open to atmospheric air and a second end open to the interior of the bottle. An expandable volumetric displacement balloon is attached to the second end of the air pressure tube and a one-way liquid valve is disposed in the outlet of the liquid flow channel in the stopper.

Abstract: The present invention, a volumetric displacement dispenser comprising a cap assembly, which further comprises a air pump/air vent assembly in communication with a volumetric displacement device; a liquid dispensing valve having an outlet connected to a spigot and inlet connected to a liquid discharge tube, which is in contact with the dispensable liquid; and a ported stopper whereby the liquid discharge tube and the volumetric displacement dispenser device are maintained in isolated contact with the dispensable liquid. The fluid in the container, once opened, is sealed with the volumetric displacement dispenser wherein the bulk of the atmosphere over the fluid is evacuated as the volumetric displacement dispenser device is inflated by atmospheric air. A small volume of liquid serves to seal the outlet check valve assembly closed.