US PATENT SUBCLASS 122 / 135.1
FLUE
Current as of:
June, 1999
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122 /
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LIQUID HEATERS AND VAPORIZERS
135.1
FLUE
{4}
135.2
DF
.~
> Alternative stack
135.3
DF
.~
> Sinusoidal flue
136 R
DF
.~
> Horizontal {7}
155.1
DF
.~
> Vertical {16}
DEFINITION
Classification: 122/135.1
FLUE:
(under the class definition) Boilers having one or more large fire tubes or flues wholly or partly surrounded by the water space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
6+, for industrial furnace boilers.
20, 37, 47, and 48, for combinations of miscellaneous fire tube and flue boilers.
368, for miscellaneous water fire boxes.
