Pressure equalization cap and bottle for use therewith

摘要

The present invention provides a bottle cap for use in association with a bottle. The cap has a roof and sidewall, and is releasably attachable to the bottle. A flexible membrane is attached to the cap whereby an air tight seal between the flexible membrane and the bottle rim is achievable when the cap is attached to bottle. The flexible membrane is moveable responsive to change in pressure inside the bottle and the flexible membrane has an inside between the membrane and the cap. The cap has at least one flow means between the outside of the cap and the inside of the flexible membrane whereby air can move freely between the outside of the cap and the inside of the flexible membrane. The flexible membrane remains attached to the cap when the cap is removed from the bottle.