US PATENT SUBCLASS 60 / 664
.~.~ Of or by heat source material or element

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

643  DF  MOTIVE FLUID ENERGIZED BY EXTERNALLY APPLIED HEAT {11}
660  DF  .~ Having condition responsive control {6}
664.~.~ Of or by heat source material or element {1}
665  DF  .~.~.~> And of or by boiler liquid level or feed

DEFINITION

Classification: 60/664

(under subclass 660) Apparatus, in which (1) a control element of the heat input is actuated by response to a change of a sensed condition, (2) the condition of a heat source material is controlled or (3) a means sensing a condition of the heat source or heat source material controls the apparatus.

SEE OR SEARCH CLASS

431, Combustion,

18+, for the automatic control of combustion apparatus, per se.