US PATENT SUBCLASS 60 / 641.12
.~.~.~ Air is working fluid

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

641.1  DF  UTILIZING NATURAL HEAT {3}
641.8  DF  .~ Solar {4}
641.11  DF  .~.~ With elevated structure {1}
641.12.~.~.~ Air is working fluid

DEFINITION

Classification: 60/641.12

Air is working fluid:

(under subclass 641.11) Apparatus wherein the substance is air.