US PATENT SUBCLASS 431 / 38
.~.~.~ By pressure of 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}
38.~.~.~ By pressure of feed in structure

DEFINITION

Classification: 431/38

(under subclass 37) Apparatus in which the feed admission mean is controlled by means sensing the pressure within the feed containing section of the structure.

SEE OR SEARCH CLASS

48, Gas: Heating, and Illuminating,

106, for a retort not associated with a fuel burner regulated by the pressure of the gas either in the retort or gasometer.