US PATENT SUBCLASS 381 / 412
.~.~ Magnetic circuit

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.~.~ Magnetic circuit {8}
413  DF  .~.~.~> Having damping
414  DF  .~.~.~> Flux modifying means
415  DF  .~.~.~> Magnetic liquid
416  DF  .~.~.~> Inverted (e.g., within cone)
417  DF  .~.~.~> Armature diaphragm
418  DF  .~.~.~> Armature linked to diaphragm
419  DF  .~.~.~> Not having central magnetic portion
420  DF  .~.~.~> Having central magnetic portion {1}

DEFINITION

Classification: 381/412

Magnetic circuit:

(under subclass 396) Subject matter including a path of magnetic flux from north pole to south pole of a magnet (or electromagnet) through a magnetic material.