US PATENT SUBCLASS 454 / 253
.~.~ For outlet airway

Current as of: June, 1999
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454 /   HD   VENTILATION

237  DF  HAVING BOTH INLET AND OUTLET AIRWAYS {6}
251  DF  .~ With air pump means {2}
253.~.~ For outlet airway

DEFINITION

Classification: 454/253

For outlet airway:

(under subclass 251) Subject matter wherein the air moving means directly contacts air to force it out of the ventilated space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

252, for air pump means for both inlet and outlet airways.