US PATENT SUBCLASS 202 / 142
.~.~.~.~.~.~.~.~ Alternatively poor and/or rich gas fuel

Current as of: June, 1999
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202 /   HD   DISTILLATION: APPARATUS

81  DF  APPARATUS {4}
82  DF  .~ Systems {6}
96  DF  .~.~ Thermolytic {5}
105  DF  .~.~.~ Retort {14}
133  DF  .~.~.~.~ Horizontal {6}
138  DF  .~.~.~.~.~ With flues {2}
139  DF  .~.~.~.~.~.~ Vertical {2}
141  DF  .~.~.~.~.~.~.~ With reversible regenerators {3}
142.~.~.~.~.~.~.~.~ Alternatively poor and/or rich gas fuel

DEFINITION

Classification: 202/142

(under subclass 141) Apparatus coming, in which the currents of combustible material and those of air and/or gas are periodically reversed and the latter heated. If rich gas is used, the heating of gas may be omitted. There may be dilution of rich gas fuel with nitrogen, air, or products of combustion.