.~ Including structure for mixing plural air streams together {4}
262
.~.~ And having specific noise inhibiting structure
DEFINITION
Classification: 454/262
And having specific noise inhibiting structure:
(under subclass 261) Subject matter in which particular significance is attributed to a configuration which prevents or deadens unwanted sound produced during the uniting of the separately originating currents of air.
(1) Note. The specific noise inhibiting structure must be positively claimed for proper original patent placement in this subclass.
(2) Note. See the Search Class notes below for references to lines between Class 454 and other classes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
206, for a window mounted air pump including specific noise inhibiting structure.
346, for an outlet airway having vibration absorbing or preventing structure.
906, for a cross-reference art collection of ventilating structure combined with noise inhibiting means.
SEE OR SEARCH CLASS 181, Acoustics, particularly
212+, for a fluid-conducting-type sound muffler of a general nature (and see subclass 212 (1) Note, for the line between Class 181 and Class 454); and subclass 224 for a sound absorbing ventilating duct or curb.
