Apparatus (1) for producing gaseous energy which may be used as fuel for driving electricity generating means comprises an oven (2), a ram (11) for feeding gas-producing waste material to the oven (2), gas burners (5) for heating the waste material while in the oven (2), and a collection vessel (25)...http://www.google.ca/patents/US6149773?utm_source=gb-gplus-sharePatent US6149773 - Generation of electricity from waste material
