US PATENT SUBCLASS 122 / 140.1
.~.~ Internal water tube

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

135.1  DF  FLUE {4}
136 R  DF  .~ Horizontal {7}
140.1.~.~ Internal water tube {7}
140.2  DF  .~.~.~> Having water tube in flue
*  DD  .~.~.~> Longitudinal {1}
142  DF  .~.~.~> Return fire tube
143  DF  .~.~.~> Spur
144  DF  .~.~.~> Subjacent firebox
145  DF  .~.~.~> Transverse {2}
148  DF  .~.~.~> Water firebox

DEFINITION

Classification: 122/140.1

Internal water tube:

(under subclass 136) Devices having some form of water tubes in the flues.

SEE OR SEARCH THIS CLASS, SUBCLASS:

43, for horizontal flue boilers having internal water tubes heated by fluid fuel.

154, for water tubes within a large horizontal flue.