US PATENT SUBCLASS 454 / 3
.~ Chimneytop or stacktop structure (e.g., cowl)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
3.~ Chimneytop or stacktop structure (e.g., cowl) {12}
4  DF  .~.~> Cap closure {1}
8  DF  .~.~> Inlet and outlet {1}
10  DF  .~.~> Inlet {1}
12  DF  .~.~> With means for mounting on brick-type chimney {1}
15  DF  .~.~> With rotary means in air current (e.g., fan, etc.) {3}
20  DF  .~.~> Having air current responsive adjustment means {2}
27  DF  .~.~> Having readily movable air current regulating means {3}
32  DF  .~.~> T-top
33  DF  .~.~> Spiral or plural stacked rings
34  DF  .~.~> Four-side outlets with shield
35  DF  .~.~> Spaced cap {2}
39  DF  .~.~> Having air current inducing jet {1}

DEFINITION

Classification: 454/3

Chimneytop or stacktop structure (e.g., cowl):

(under subclass 1) Subject matter comprising structure at an uppermost end of the vertical conduit section.

(1) Note. Cowl structure is included in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

339+, for structure at the end of an outlet conduit section. See, in particular, subclass 368.

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings)

200, for cupolas, subclass 218 for flues with gas inlets and internal gas directing features (see the notes to that subclass), and subclass 244 for a cap which is mounted on and covers the exposed terminal edge of a barrier which encloses a space, e.g., chimney top guards.