US PATENT SUBCLASS 52 / 722.1
.~.~.~ Conduit
Current as of:
June, 1999
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52 /
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STATIC STRUCTURES (E.G., BUILDINGS)
720.1
DF
SHAFT (I.E., ELONGATED RIGID STRUCTURE)
{15}
721.1
DF
.~ Stone-like component (e.g., concrete, etc.) {2}
721.2
DF
.~.~ Upright {3}
722.1
.~.~.~ Conduit
DEFINITION
Classification: 52/722.1
Conduit:
(under subclass 721.2) Structure wherein the intended purpose of the shaft is to convey a fluid (e.g., stack, well curbing, etc.).
SEE OR SEARCH THIS CLASS, SUBCLASS:
726.5, a chimney or flue comprising end-to-end connected sections.
SEE OR SEARCH CLASS
138, Pipes and Tubular Conduits,
177, for conduit structure, per se.
454, Ventilation, 1, for chimneys or stacks.