US PATENT SUBCLASS 432 / 112
.~ Externally heated drum or associated heating element heats work by conduction or radiation

Current as of: June, 1999
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432 /   HD   HEATING

103  DF  TUMBLER-TYPE ROTARY - DRUM FURNACE {8}
112.~ Externally heated drum or associated heating element heats work by conduction or radiation {2}
113  DF  .~.~> And having distinct atmosphere supply or removal structure
114  DF  .~.~> Heat emitter is tube within the drum chamber or the drum wall

DEFINITION

Classification: 432/112

(under subclass 103) Apparatus in which the work carried by the drum receives heat by contact with a heated drum surface or by radiation from a heat radiating solid structure.

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor With Solids,

140, 141, and 142 for a rotary tumbler drum type drier having a broadly recited indirect heating means.