US PATENT SUBCLASS 381 / 337
.~ Having acoustic wave modifying structure

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.~ Having acoustic wave modifying structure {5}
338  DF  .~.~> With tubular waveguide or resonant element
339  DF  .~.~> Sound intensifying or spreading element {2}
345  DF  .~.~> Acoustic enclosure {6}
354  DF  .~.~> Absorbing or attenuating element
160  DF  .~.~> Reflecting element

DEFINITION

Classification: 381/337

Having acoustic wave modifying structure:

(under subclass 150) Subject matter having a passive element for changing a characteristic of audible sound vibrations produced or detected by an electro-acoustic transducer.

SEE OR SEARCH THIS CLASS, SUBCLASS:

370, for acoustic wave modifying structures in combination with headphones.

SEE OR SEARCH CLASS

181, Acoustics,

175+, for sound- modifying means in a mechanical acoustic device or system.