US PATENT SUBCLASS 202 / 140
.~.~.~.~.~.~.~ With recuperators

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}
140.~.~.~.~.~.~.~ With recuperators

DEFINITION

Classification: 202/140

The products of combustion as they leave the system heat the air and/or gas in double-surface heaters.

SEE OR SEARCH CLASS

110, Furnaces,

230+, for a solid fuel furnace provided with coking means.

201, Distillation: Processes, Thermolytic,

15+, for a carbonizing process including burning a product of the carbonizing step and recovering heat from a product by indirect heat exchange and subclass 37, for a process in which externally produced combustion gases are passed through the retort.