US PATENT SUBCLASS 454 / 24
.~.~.~.~ Shield

Current as of: June, 1999
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454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
3  DF  .~ Chimneytop or stacktop structure (e.g., cowl) {12}
20  DF  .~.~ Having air current responsive adjustment means {2}
21  DF  .~.~.~ Wind vane {3}
24.~.~.~.~ Shield

DEFINITION

Classification: 454/24

Shield:

(under subclass 21) Subject matter wherein the rotating structure is a generally vertical deflector which shelters the vertical conduit section's uppermost portion from direct exposure to the natural air current (i.e., wind).

(1) Note. A generally horizontal, angled deflector which lies directly over an upwardly facing opening of the vertical conduit is not included in this subclass.