US PATENT SUBCLASS 122 / 309
.~.~.~ Annular firebox

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

235.11  DF  WATER TUBE {52}
305  DF  .~ Spur {8}
307  DF  .~.~ Central standpipe {3}
309.~.~.~ Annular firebox

DEFINITION

Classification: 122/309

(under subclass 307) Devices in which the central stand pipe

extends below the fire grate, forming an annular firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

186, for vertical flue boilers with a spur tube stand pipe and an annular firebox.

246, for boilers of the water tube type provided with a central stand pipe having coils or loops and an annular firebox.

323, for miscellaneous water tube boilers with a central stand pipe and an annular firebox.