US PATENT SUBCLASS 122 / 166.1
.~.~ With internal water 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}
166.1.~.~ With internal water tube {12}
166.2  DF  .~.~.~> Loop-type tube
168  DF  .~.~.~> Central magazine
169  DF  .~.~.~> Coil {1}
171  DF  .~.~.~> Contracted inlet
172  DF  .~.~.~> Header
173  DF  .~.~.~> Horizontal spur
174  DF  .~.~.~> Internal fire tube
175  DF  .~.~.~> Offset water firebox
176  DF  .~.~.~> Transverse {1}
178  DF  .~.~.~> Vertical aligned fire tube {2}
181  DF  .~.~.~> Vertical spur
167  DF  .~.~.~> Fluid fuel

DEFINITION

Classification: 122/166.1

With internal water tube:

Vertical flue boilers under subclasses 155.1+ having water tubes within the flue in communication with the boiler.

SEE OR SEARCH THIS CLASS, SUBCLASS:

131, for vertical water tube boilers with water tubes in the flues.

184, through 187, for vertical flue boilers having a central standpipe provided with water tubes located in the vertical flue.

468, for boilers of that type having steam superheater.