Sure it seems counter-intuitive at first, but if you consider that any gas a particular temperature will condense at a certain pressure, why would forcing in more gas increase the pressure when it is past the critical point for condensing? Wouldn't it rather just condense? The equation PV=nRT still holds true, it's just that the pressure is constant while the volume (of the gas) decreases as the liquid level increases and the number of moles of gas decreases (as it becomes liquid). http://www.vias.org/genchem/phase_equi_12596_05.html Mixtures of gases is more complicated, as it depends on the solubility of the other gases in the first one that condenses.
How about a mini wind turbine in your back yard? It figures an Indian company is willing to build this. We'll never see this technology being sold in the west. Not as long as the oil lobby is around. A cup of "peak oil" anyone? It's with mint.