US PATENT SUBCLASS 432 / 223
.~.~ Having means for indirectly exchanging heat between combustion products and material

Current as of: June, 1999
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432 /   HD   HEATING

219  DF  HEAT GENERATOR HEATS GAS OR LIQUID MATERIAL IN A FLOW STRUCTURE {3}
222  DF  .~ Material heated by mixing with combustion products of generator {1}
223.~.~ Having means for indirectly exchanging heat between combustion products and material

DEFINITION

Classification: 432/223

(under subclass 22) Apparatus including a confining passage by which a stream of the gas to be intermingled or a stream of combustion feed fluid is passed in heat exchange with the combustion products flowing to the mixing zone.