US PATENT SUBCLASS 454 / 240
.~ With wind-operated air pump
Current as of:
June, 1999
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454 /
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VENTILATION
237
DF
HAVING BOTH INLET AND OUTLET AIRWAYS
{6}
240
.~ With wind-operated air pump
DEFINITION
Classification: 454/240
With wind-operated air pump:
(under subclass 237) Subject matter comprising an air moving apparatus powered by natural air current for forcing air to or from the ventilated space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
15, for a wind-operated fan associated with chimney or stacktop structure.
101, for a wind-operated fan in a railcar, bus, or trailer used for forced recirculation.
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.
