Patent ID: 7337930

Claim:
A foaming pump having: a piston reciprocally slidable in a piston chamber forming element in which: (a) in the piston retracting in a retracting stroke to simultaneously force air from an air chamber and liquid from a liquid chamber internally through a central bore of the piston and through a foam generator to produce foam and deliver foam from a dispensing outlet carried on the piston, and (b) in the piston extending in an extension stroke to simultaneously draw air into the air chamber and liquid into the liquid chamber, an air inlet passageway for providing communication between external air and the air chamber, a valve across the air inlet passageway to open and close the air inlet passageway, the valve coupled to the piston to mechanically be moved to a closed position when the piston is retracting in a retraction stroke and to assume an open position when the piston is extending in an extension stroke.