US PATENT SUBCLASS 381 / 340
.~.~.~ Horn

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.~.~.~ Horn {3}
341  DF  .~.~.~.~> Inverted, folded, or curled
342  DF  .~.~.~.~> Plural horns or diaphragms
343  DF  .~.~.~.~> Phase plug

DEFINITION

Classification: 381/340

Horn:

(under subclass 339) Subject matter in which the intensifying element is a tubular element having a crossectional area which varies along the element's length.

SEE OR SEARCH CLASS

181, Acoustics,

177+, for a mechanical acoustic, intensifying horn.