US PATENT SUBCLASS 122 / 164
.~.~ Insulated outlet flue

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}
164.~.~ Insulated outlet flue

DEFINITION

Classification: 122/164

(under subclass 155) Vertical flue boilers having the outlet flue through the steam space of the boiler provided with a heat insulator to prevent heating the steam space. This insulator may be of some packing material or formed by an air chamber.

SEE OR SEARCH THIS CLASS, SUBCLASS:

125, for vertical fire tube boilers with top water chambers.