US PATENT SUBCLASS 122 / 323
.~.~ Annular firebox


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

235.11  DF  WATER TUBE {52}
321  DF  .~ Standpipe {2}
323.~.~ Annular firebox


DEFINITION

Classification: 122/323

(under subclass 321) Devices in which the stand pipe extends downwardly below the fire grate, forming an annular firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

184, 246, 309, and 475, for stand pipes provided with spur

tubes having an annular firebox.