US PATENT SUBCLASS 122 / 294
.~.~.~.~.~ Water wall

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}
291  DF  .~.~.~.~ Horizontal-longitudinal drum {3}
294.~.~.~.~.~ Water wall

DEFINITION

Classification: 122/294

(under subclass 291) Devices, provided with water walls on two or more sides of the combustion chamber, consisting of metal sheets spaced apart or formed of water tubes. There may or may not be cross water tubes extending through the combustion chamber.