US PATENT SUBCLASS 454 / 298
.~.~.~.~.~ Axially movable or sliding valve

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}
292  DF  .~.~ Ceiling type {4}
296  DF  .~.~.~ Including perforated or porous element {1}
297  DF  .~.~.~.~ Having portion or element movable during normal use {1}
298.~.~.~.~.~ Axially movable or sliding valve

DEFINITION

Classification: 454/298

Axially movable or sliding valve:

(under subclass 297) Subject matter comprising a means for regulating the quantity of airflow wherein the means (1) relocates along a path parallel to a general direction of airflow immediately prior to its contact with the means or (2) translates along another portion of the means.

(1) Note. Regarding (2), above, the airflow altering means usually comprises two adjacent surface elements each having a group of holes therethrough, wherein the two elements translate relative to one another to vary airflow by bringing the groups of holes into and out of alignment with one another.