It appears Sky Station International is loaded with some interesting patents - a low thrust ion engine, (produces Ozone gas) : http://www.google.com/patents/US6145298?dq=inassignee:%22Sky+Station+International,+Inc.%22&hl=en&sa=X&ei=Jdj6Ua-xHtDDiwKct4GYCQ&ved=0CG4Q6AEwCA http://www.google.com/search?tbo=p&tbm=pts&hl=en&q=inassignee:%22Sky+Station+International,+Inc.%22