US PATENT SUBCLASS 431 / 61
.~.~ By fuel feed pressure variation

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
60  DF  .~ Of sequential operation of plural burners, e.g., pilot and main, etc. {1}
61.~.~ By fuel feed pressure variation

DEFINITION

Classification: 431/61

(under subclass 60) Apparatus in which the starting and stopping of the burners is in response to changes in the fuel feed pressure.