US PATENT SUBCLASS 122 / 470
.~.~.~ Waste-heat flue

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

459  DF  STEAM TREATMENT {7}
*  DD  .~ Horizontal boiler {1}
*  DD  .~.~ Superheater {2}
470.~.~.~ Waste-heat flue

DEFINITION

Classification: 122/470

(under subclass 459) Subject matter relating to the structure and arrangement of a superheater in the waste heat flue of a horizontally located boiler.

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412+, and especially subclass 421 for heat exchange features in feed heaters.

SEE OR SEARCH CLASS

165, Heat Exchange,

157+, for a tube assembly in a casing or flue of general utility.