US PATENT SUBCLASS 454 / 267
.~.~.~.~ Plural

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.~.~.~.~ Plural {1}
268  DF  .~.~.~.~.~> Including parrallel louver vanes

DEFINITION

Classification: 454/267

Plural:

(under subclass 266) Subject matter having at least two

swinging slats, bodies, caps, closures, or a combination of at least two elements thereof.

(1) Note. A set of grouped pivoted slats (e.g., a pivoted louver set) is considered sufficient for inclusion in this subclass and its indented subclass.