US PATENT SUBCLASS 454 / 251
.~ With air pump means

Current as of: June, 1999
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454 /   HD   VENTILATION

237  DF  HAVING BOTH INLET AND OUTLET AIRWAYS {6}
251.~ With air pump means {2}
252  DF  .~.~> For both inlet and outlet airways
253  DF  .~.~> For outlet airway

DEFINITION

Classification: 454/251

With air pump means:

(under subclass 237) Subject matter comprising air moving means for forcing air into or out of the ventilated space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

239, for inlet and outlet airways including automatic control means and an air pump.

240, for inlet and outlet airways including a wind-operated air pump.

241+, for a unitary inlet and outlet housing with an air pump, particularly subclasses 243+ and 249.