US PATENT SUBCLASS 381 / 420
.~.~.~ Having central magnetic portion

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}
420.~.~.~ Having central magnetic portion {1}
421  DF  .~.~.~.~> Plural magnets {1}

DEFINITION

Classification: 381/420

Having central magnetic portion:

(under subclass 412) Subject matter in which there is an innermost magnet or pole piece around which other parts of the magnetic circuit are symmetrically located.

(1) Note. This configuration is most often associated with the standard conically-shaped diaphragm with cylindrical bobbin and centrally located annular air gap.