US PATENT SUBCLASS 60 / 641.13
.~.~ With single state working substance

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}
641.13.~.~ With single state working substance {1}
641.14  DF  .~.~.~> Gaseous

DEFINITION

Classification: 60/641.13

With single state working substance:

(under subclass 641.8) Apparatus wherein the heat heats a substance (solid or liquid) for producing work, the substance remaining in its solid or fluid state at all times.