US PATENT SUBCLASS 432 / 212
.~ Tortuous, branched or baffled heating flue means within or along chamber wall

Current as of: June, 1999
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432 /   HD   HEATING

120  DF  WORK CHAMBER HAVING HEATING MEANS {12}
212.~ Tortuous, branched or baffled heating flue means within or along chamber wall {1}
213  DF  .~.~> Having distinct burner units

DEFINITION

Classification: 432/212

(under subclass 120) Apparatus in which combustion products heating the work chamber atmosphere move through a conduit means within the wall of the chamber or including the chamber wall as a part thereof, the conduit means providing a tortuous, branched, or plural passages to distribute heat with respect to the chamber while holding the combustion products separated from the chamber atmosphere.

SEE OR SEARCH THIS CLASS, SUBCLASS:

155, for a chamber through which work is progressed or moved mechanically heated by multiple combustion product flues.