US PATENT SUBCLASS 381 / 423
.~.~ Specified diaphragm shape or structure

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.~.~ Specified diaphragm shape or structure {6}
424  DF  .~.~.~> Plural portions or sections {1}
426  DF  .~.~.~> Critically defined material or lamination {2}
429  DF  .~.~.~> Apertures in surface
430  DF  .~.~.~> Dome or round
431  DF  .~.~.~> Flat
432  DF  .~.~.~> Conical

DEFINITION

Classification: 381/423

Specified diaphragm shape or structure:

(under subclass 396) Subject matter including a flexible membrane with a particular geometrical contour or made of a specified material.

SEE OR SEARCH CLASS

181, Acoustics,

167+, or 173+ for critically defined acoustic diaphragm structure or shape, generally.