US PATENT SUBCLASS 122 / 182.1
.~.~ With return fire tube

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

135.1  DF  FLUE {4}
155.1  DF  .~ Vertical {16}
182.1.~.~ With return fire tube {2}
182.2  DF  .~.~.~> Having symmetrical arrangement of tubes
182.3  DF  .~.~.~> Having tubes offset from firebox

DEFINITION

Classification: 122/182.1

With return fire tube:

Devices under subclasses 155.1+ having small vertical fire tubes, through which the products of combustion are returned through the boiler after leaving the large flues. The fire tubes may be within the same boiler section as the large flue or in a separate boiler section.

SEE OR SEARCH THIS CLASS, SUBCLASS:

121, and 122, for return fire tube vertical fire tube boilers.