US PATENT SUBCLASS 454 / 18
.~.~.~ Cage-type blade set

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}
15  DF  .~.~ With rotary means in air current (e.g., fan, etc.) {3}
18.~.~.~ Cage-type blade set {1}
19  DF  .~.~.~.~> Including additional blade set

DEFINITION

Classification: 454/18

Cage-type blade set:

(under subclass 15) Subject matter wherein the unidirectionally rotating member comprises a hollow cylinder with two or more strip-like (blade) structures extending along the periphery thereof, which structures act on or are acted on by (1) flow of natural air (i.e., wind) or (2) flow of air or products of combustion through the vertical conduit section.

(1) Note. A cage-type blade set is often referred to as a turbine.