US PATENT SUBCLASS 52 / 722.1
.~.~.~ Conduit

Current as of: June, 1999
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52 /   HD   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.