US PATENT SUBCLASS 431 / 30
.~.~ Of scavenging or purging pump

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
29  DF  .~ Control of purger, of scavenger or of combustion start-up delay period {1}
30.~.~ Of scavenging or purging pump {1}
31  DF  .~.~.~> Scavenging or purging period started by combustion demand

DEFINITION

Classification: 431/30

(under subclass 29) Apparatus wherein the control provides for the operation of a mechanical impelling means to flush the burner with noncombustible material (e.g., air, steam, etc.) during the scavenging or combustion start up delay period.