US PATENT SUBCLASS 431 / 74
.~.~ Combustion zone sensor controls igniter

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
72  DF  .~ Of igniter and feed controlled sequence {2}
74.~.~ Combustion zone sensor controls igniter

DEFINITION

Classification: 431/74

(under subclass 72) Apparatus including a sensor responsive to the presence of flame in a combustion zone controlling the igniter.

SEE OR SEARCH THIS CLASS, SUBCLASS:

46, for an igniter deenergized responsive to ignition of a burner and in which a sensor of this burner controls another burner.