US PATENT SUBCLASS 381 / 419
.~.~.~ Not 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}
419.~.~.~ Not having central magnetic portion

DEFINITION

Classification: 381/419

Not having central magnetic portion:

(under subclass 412) Subject matter in which the magnetic circuit lacks an innermost magnet or pole piece.

(1) Note. This configuration usually lacks a central annular air gap, and it is often associated with an armature diaphragm. Typical shapes include annular, horseshoe, or U-shaped.

SEE OR SEARCH THIS CLASS, SUBCLASS:

417, for an armature diaphragm in a magnetic circuit.