US PATENT SUBCLASS 454 / 274-- .~.~.~.~ Sliding or axially moveable

US PATENT SUBCLASS 454 / 274
.~.~.~.~ Sliding or axially moveable

Current as of: June, 1999
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454 /	HD	VENTILATION

254	DF	HAVING INLET AIRWAY {11}
270	DF	.~ Sleeved vent for ceiling, wall, or floor (e.g., thimble) {1}
271	DF	.~.~ Wall type {2}
273	DF	.~.~.~ Having adjustable valve {1}
274		.~.~.~.~ Sliding or axially moveable

DEFINITION

Classification: 454/274

Sliding or axially moveable:

(under subclass 273) Subject matter wherein the regulating means (1) relocates along a path parallel to a general direction of airflow immediately prior to its contact with the means or (2) comprises a portion which translates along another portion of the means.

(1) Note. Regarding (2), above, the airflow regulating 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.