US PATENT SUBCLASS 381 / 426
.~.~.~ Critically defined material or lamination

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}
426.~.~.~ Critically defined material or lamination {2}
427  DF  .~.~.~.~> Metal
428  DF  .~.~.~.~> Fibrous

DEFINITION

Classification: 381/426

Critically defined material or lamination:

(under subclass 423) Subject matter specifying the use of a particular substance or a layered structure.