US PATENT SUBCLASS 381 / 428
.~.~.~.~ Fibrous

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  DF  .~.~.~ Critically defined material or lamination {2}
428.~.~.~.~ Fibrous

DEFINITION

Classification: 381/428

Fibrous

(under subclass 426) Subject matter in which the particular material is comprised of slender, elongated structures, such as threads, filaments, etc.

(1) Note. Paper and cardboard are materials made from cellulose fibers.

SEE OR SEARCH CLASS

181, Acoustics,

169, for fibrous material in diaphragm in acoustic devices.