US PATENT SUBCLASS 122 / 295
.~.~.~.~ Internal water tube

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

235.11  DF  WATER TUBE {52}
*  DD  .~ Rearwardly declined {3}
*  DD  .~.~ Over bridge wall {1}
290  DF  .~.~.~ Front and rear header {4}
295.~.~.~.~ Internal water tube

DEFINITION

Classification: 122/295

(under subclass 290) Devices in which the tubes have within them and spaced therefrom smaller tubes communicating with separate compartments of the headers, and such tubes not being of the spur tube or "Field" tube type. These headers may be in communication with longitudinally or transversely disposed drums.

SEE OR SEARCH THIS CLASS, SUBCLASS:

305+, for spur tubes.

474, for super heaters for water tube boilers having banks of tubes over the bridge wall.