US PATENT SUBCLASS 60 / 641.6
.~ With natural temperature differential

Current as of: June, 1999
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60 /   HD   POWER PLANTS

641.1  DF  UTILIZING NATURAL HEAT {3}
641.6.~ With natural temperature differential {1}
641.7  DF  .~.~> Ocean thermal energy conversion (OTEC)

DEFINITION

Classification: 60/641.6

With natural temperature differential:

(under subclass 641.1) Apparatus in which power is generated as a result of a variance in temperature occurring naturally from two distinct geos:graphical locations.

(1) Note. Devices such as "drinking birds" are here classified.