US PATENT SUBCLASS 381 / 341
.~.~.~.~ Inverted, folded, or curled

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
337  DF  .~ Having acoustic wave modifying structure {5}
339  DF  .~.~ Sound intensifying or spreading element {2}
340  DF  .~.~.~ Horn {3}
341.~.~.~.~ Inverted, folded, or curled

DEFINITION

Classification: 381/341

Inverted, folded, or curled:

(under subclass 340) Subject matter in which a) a crossectional area of the sound conducting element decreases as a distance from a diaphragm increases, or b) the sound path of the element has one or more sharp bends, or c) an entrance of the element is smoothly curved back toward an exit.

SEE OR SEARCH CLASS

181, Acoustics,

194, for mechanica acoustic, intensifying horn having a doubly folded sound path.