Patent ID: 6308866
Filing Date: 2001-10-30
Classification: A47K,B05B,H04N

Abstract:
A foam dispensing apparatus comprising:a reservoir containing a foamable liquid said reservoir having a closed headspace above a surface of the liquid;a source of a gas disposed to impose a gas pressure higher than ambient atmospheric pressure into said closed headspace;a mixing chamber having an inside diameter, an inlet and an outlet open to the ambient atmosphere,a first flow restricter having at least one opening therein in gaseous communication with said closed headspace, said first flow restricter being disposed at said inlet of said mixing chamber;an elongate delivery tube and an open passageway therethrough having a longitudinal axis extending from said inlet of said mixing chamber to below the surface of the foamable liquid disposed so that an application of the gas having higher pressure than atmospheric pressure to the headspace causes the liquid to flow through said tube past said first flow restricter and wherein the headspace gas having higher pressure than atmospheric pressure flows from said openings in said first flow restricter to mix with the foamable liquid and to expand to atmospheric pressure in said mixing chamber thereby to form a foam from the foamable liquid and discharge said foam from said outlet; anda hydrophobic filter disposed between the pressure source and the reservoir.