Patent ID: 7661561

Claim:
A method of dispensing foam comprising: providing a first reservoir with a first fluid capable of foaming; providing a second reservoir of a flowable material; passing the first fluid together with air through a porous member to produce and extrude to an outlet an intermediate product including foam; simultaneously dispensing the flowable material to the outlet thereby producing a final product comprising the intermediate product including foam and the flowable material, wherein the flowable material is a second fluid and the step of simultaneously dispensing comprises simultaneously extruding the second fluid to the outlet, and the intermediate product including foam and the second fluid are each extruded as extrudate streams in a parallel direction, one of the streams being annular about the other of the streams; the first fluid and air are pressurized to be passed through the porous member and extruded as the intermediate product including foam, and the second fluid is simultaneously extruded by the movement of a single piston member within a piston chamber forming element defining therebetween an air chamber having an air inlet and an air outlet, a first fluid chamber having an inlet in communication with the first reservoir and an outlet, and a second fluid chamber having an inlet in communication with the second reservoir and wherein the piston member is reciprocally movable in the piston chamber forming element and a movement in a first direction, air is drawn into the air chamber, the first fluid is drawn into the first fluid chamber and the second fluid is drawn into the second fluid chamber and in movement in the opposite direction, air is expelled from the air outlet of the air chamber, the first fluid is expelled from the outlet of the first fluid chamber and the second fluid is expelled from the outlet of the second fluid chamber.