US PATENT SUBCLASS 52 / 726.5
.~.~.~ Chimney, flue, etc.

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}
726.1  DF  .~ End-to-end connected sections {2}
726.3  DF  .~.~ Upright {2}
726.5.~.~.~ Chimney, flue, etc.

DEFINITION

Classification: 52/726.5

Chimney, flue, etc.:

(under subclass 726.3) Upright structure which is intended to function as an outlet for a noxious gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:

218, for a flue with gaseous fluid directing feature.

219, for flue connection to a structure.

722.1, for a stone-like conduit.

SEE OR SEARCH CLASS

454, Ventilation,

1, for chimney or stack structure.