A miniature apparatus for compressing gases is disclosed in which an elastomer disposed between two opposing electrostrictive or piezoelectric ceramic blocks, or between a single electrostrictive or piezoelectric ceramic block and a rigid surface, is caused to extrude into or recede from a channel defined...http://www.google.com.au/patents/US4515534?utm_source=gb-gplus-sharePatent US4515534 - Miniature solid-state gas compressor
