The present patent incorporates major improvements and simplifications of 1976 U.S. Pat. No. 3,967,449 necessary to make the concept functional and useful on a large scale. The earlier patent listed many approaches to the several design problems believed to be necessary at the time of the earlier application,...http://www.google.fr/patents/US6202417?utm_source=gb-gplus-shareBrevet US6202417 - Ocean thermal gradient hydraulic power plant
