US PATENT SUBCLASS 454 / 276
.~.~ Wall type
Current as of:
June, 1999
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454 /
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VENTILATION
254
DF
HAVING INLET AIRWAY
{11}
275
DF
.~ Including specific cover or shield for exterior vent opening {1}
276
.~.~ Wall type {1}
277
DF
.~.~.~
> Louver {5}
DEFINITION
Classification: 454/276
Wall type:
(under subclass 275) Subject matter wherein the means is located in a generally planar surface which extends vertically, i.e., parallel to the force of gravity.