US PATENT SUBCLASS 122 / 305
.~ Spur

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

235.11  DF  WATER TUBE {52}
305.~ Spur {8}
306  DF  .~.~> Bridge wall header
307  DF  .~.~> Central standpipe {3}
311  DF  .~.~> Cross
312  DF  .~.~> Horizontal-longitudinal drum
313  DF  .~.~> Over bridge wall
*  DD  .~.~> Over firebox {3}
317  DF  .~.~> Straddle
318  DF  .~.~> Vertical {2}

DEFINITION

Classification: 122/305

(under subclass 235) Devices having spur tubes projecting from a drum or equivalent, communicating therewith at one end and having the other end closed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

133, 143, 173, 180, 181, 186, 342, and 462, for other boilers having spur tubes which form some substantial part of the heating surface.

275+, for water tube boilers of similar types having looped tubes.