US PATENT SUBCLASS 381 / 309
.~.~ Stereo earphone

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

1  DF  BINAURAL AND STEREOPHONIC {8}
300  DF  .~ Stereo speaker arrangement {7}
309.~.~ Stereo earphone {2}
310  DF  .~.~.~> Virtual positioning
311  DF  .~.~.~> Wireless or for use in diverse

DEFINITION

Classification: 381/309

Stereo earphone:

(under subclass 300) Subject matter in which the transducers are intended to be placed in or over the user's ears.