US PATENT SUBCLASS 454 / 268
.~.~.~.~.~ Including parrallel louver vanes

Current as of: June, 1999
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454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
261  DF  .~ Including structure for mixing plural air streams together {4}
265  DF  .~.~ With readily movable air regulating louver, damper, or cover {1}
266  DF  .~.~.~ Pivoted {1}
267  DF  .~.~.~.~ Plural {1}
268.~.~.~.~.~ Including parrallel louver vanes

DEFINITION

Classification: 454/268

Including parallel louver vanes:

(under subclass 267) Subject matter wherein the multiple swinging slats, bodies, caps closures, or combination thereof, include at least one set of slats having swinging members everywhere equidistant from each other.