US PATENT SUBCLASS 381 / 414
.~.~.~ Flux modifying means

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}
396  DF  .~ Electromagnetic (e.g., dyynamic) {8}
412  DF  .~.~ Magnetic circuit {8}
414.~.~.~ Flux modifying means

DEFINITION

Classification: 381/414

Flux modifying means:

(under subclass 412) Subject matter which shapes or alters the magnetic flux in the air gap in order to enhance its effectiveness in reacting with a voice coil or diaphragm.