US PATENT SUBCLASS 122 / 121
.~.~ Return fire tube

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

44.1  DF  FIRE TUBE {11}
114  DF  .~ Vertical {13}
121.~.~ Return fire tube {1}
122  DF  .~.~.~> Water firebox

DEFINITION

Classification: 122/121

(under subclass 114) Devices provided with fire tubes through which the products of combustion pass upon leaving the firebox and also fire tubes through which the products of combustion return to the other end of the boiler before they enter the outlet flue.

SEE OR SEARCH THIS CLASS, SUBCLASS:

128, for this type of boiler having a central magazine.

182, for vertical flue boilers having return fire tubes.