Patent ID: 7086427

Claim:
A vacuum pump for extracting air contained in a bottle of which a partial consumption has been carried out, the vacuum pump comprising a cylindrical support externally couplable to a neck of a bottle; an internal stopper coupled to said support through its head and also coupleable to an interior of the neck of the bottle in a fixed and tight manner, an external cap axially movable with regard to said intermediate support; an external one-way valve arranged between said cap and said support; and an internal one-way valve provided in said internal stopper, such that when said cap is moved axially outwardly said external valve is maintained close while said internal valve opens allowing for an absorption of air from an interior of the bottle to a chamber created between said stopper and said cap, whereas during an opposite movement of said cap said internal valve closes and said external valve opens, allowing for an outflow of air housed in said chamber toward an exterior.