A hand-held foaming apparatus includes a pressure vessel for containing a foamable liquid and an air space overlying the liquid. A hand pump is mounted within the vessel and sealably connected to a sealable opening at the top of the vessel. The pump comprises an external handle connected to a piston...http://www.google.com.au/patents/US6367663?utm_source=gb-gplus-sharePatent US6367663 - Hand-operated foaming apparatus with interchangeable nozzle
