US PATENT SUBCLASS 381 / 408
.~.~.~ Pattern

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}
400  DF  .~.~ Movable voice coil {8}
408.~.~.~ Pattern

DEFINITION

Classification: 381/408

Pattern:

(under subclass 400) Subject matter where the voice coil comprises a particular configuration of conductive material applied directly to the diaphragm.

(1) Note. The diaphragm is usually flat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

410, for coil structure in a cylindrically wound coil (e.g. on a bobbin ).