A method of leaching a material from a cavity having a closed or a partially closed top. The method consists of subjecting the liquid to a number of pressure cycles, each pressure cycle involving a decrease in pressure to cause boiling of the liquid, followed by a rise in pressure to inhibit the boiling....http://www.google.fr/patents/US4294805?utm_source=gb-gplus-shareBrevet US4294805 - Method of leaching the contents of a can
