US PATENT SUBCLASS 454 / 15
.~.~ With rotary means in air current (e.g., fan, etc.)

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.~.~ With rotary means in air current (e.g., fan, etc.) {3}
16  DF  .~.~.~> Driven by external power source
17  DF  .~.~.~> Having air current responsive adjustment means (e.g., wind vane, etc.)
18  DF  .~.~.~> Cage-type blade set {1}

DEFINITION

Classification: 454/15

With rotary means in air current (e.g., fan, etc.):

(under subclass 3) Subject matter comprising a unidirectionally rotating member which acts on or is 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. The member may be referred to as a rotor, wheel, bucket wheel, rotary fan, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

101, for a wind-operated recirculating fan associated with a railcar, bus, or trailer.

106, for other railcar, bus, or trailer wind-operated fans associated with an inlet and outlet airway.

113, for other railcar, bus, or trailer wind-operated fans associated with an inlet airway only.

117, for a railcar, bus, or trailer having a wind-operated fan associated with an outlet airway.

240, for a wind-operated air pump associated with a building having both an inlet and an outlet airway.