US PATENT SUBCLASS 431 / 56
.~.~.~ Having cut-off valve by-pass or additional supply to first burner

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
42  DF  .~ Sensor of first burner controls second burner, e.g., pilot and main, etc. {8}
51  DF  .~.~ Both burners cut off upon sensed extinguishment of first burner {2}
56.~.~.~ Having cut-off valve by-pass or additional supply to first burner

DEFINITION

Classification: 431/56

(under subclass 51) Apparatus including a fuel conduit acting as a bypass around the valve means of the first burner, or means supplying fuel down stream of the valve means for the first burner.