US PATENT SUBCLASS 431 / 39
.~.~.~ By level of liquid feed in structure

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
36  DF  .~ Of or by burner feed supply heating structure {2}
37  DF  .~.~ By controlling admittance of feed to structure {3}
39.~.~.~ By level of liquid feed in structure

DEFINITION

Classification: 431/39

(under subclass 37) Apparatus in which the feed admission means is controlled by means measuring the liquid level in the fuel containing section of the structure.