US PATENT SUBCLASS 454 / 330
.~.~ Having register box, frame, or grating

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}
330.~.~ Having register box, frame, or grating {1}
331  DF  .~.~.~> Including specific grating or grating mounting structure {1}

DEFINITION

Classification: 454/330

Having register box, frame, or grating:

(under subclass 284) Subject matter comprising a casing, support, or grill-like exit structure for a means which releases or directs the air immediately into the ventilated space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

270+, for a sleeved vent in a ceiling, wall, or floor.