US PATENT SUBCLASS 454 / 21
.~.~.~ Wind vane

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.~.~.~ Wind vane {3}
22  DF  .~.~.~.~> With air current inducing jet {1}
24  DF  .~.~.~.~> Shield
25  DF  .~.~.~.~> Hood having outlet opening perpendicular to wind

DEFINITION

Classification: 454/21

Wind vane:

(under subclass 20) Subject matter wherein the structure or a portion thereof rotates to maintain a particular orientation relative to changing natural air (i.e., wind) flow direction.

(1) Note. The structure usually rotates about a vertical axis.