An internal combustion engine in which heat is derived from the engine cooling system and the exhaust to heat a working fluid and to transform it into a gas which drives a turbine which operates a generator. Direct current from the latter is delivered to an electrolysis cell containing purified water...http://www.google.com.au/patents/US4099489?utm_source=gb-gplus-sharePatent US4099489 - Fuel regenerated non-polluting internal combustion engine
