US PATENT SUBCLASS 122 / 266
.~ Internal fire tube

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

235.11  DF  WATER TUBE {52}
266.~ Internal fire tube {5}
267  DF  .~.~> Horizontal
268  DF  .~.~> Inclined
269  DF  .~.~> Plural fire tube
270  DF  .~.~> Straddle
271  DF  .~.~> Vertical {1}

DEFINITION

Classification: 122/266

(under subclass 235) Water-tube boilers provided with water tubes within which there is a fire tube forming an annular water space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

242+, for capillary tubes constructed in this manner.

348, for vertical water tubes having internal fire tubes.