US PATENT SUBCLASS 454 / 326
.~.~.~.~ Adjacent blades pivot in opposing directions

Current as of: June, 1999
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454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
284  DF  .~ Including specific air distributor (e.g., register, etc.) {14}
322  DF  .~.~ With adjustable valve {4}
325  DF  .~.~.~ Plural blades pivoting along parrallel axes {1}
326.~.~.~.~ Adjacent blades pivot in opposing directions

DEFINITION

Classification: 454/326

Adjacent blades pivot in opposing directions:

(under subclass 325) Subject matter wherein the two slats or panels are positioned next to another and wherein the slats or panels rotate about their axes in opposite directions.