US PATENT SUBCLASS 381 / 432
.~.~.~ Conical

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}
423  DF  .~.~ Specified diaphragm shape or structure {6}
432.~.~.~ Conical

DEFINITION

Classification: 381/432

Conical:

(under subclass 423) Subject matter where a diaphragm has a configuration of at least a portion of a regular solid

joining the circumference of a circle in a plane with a point along its axis of symmetry outside the plane.

(1) Note. This encompasses conical and frusto-conical shapes.