US PATENT SUBCLASS 381 / 346
.~.~.~ Acoustic resistance

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}
337  DF  .~ Having acoustic wave modifying structure {5}
345  DF  .~.~ Acoustic enclosure {6}
346.~.~.~ Acoustic resistance {2}
347  DF  .~.~.~.~> On front side of diaphragm
348  DF  .~.~.~.~> On rear side of diaphragm

DEFINITION

Classification: 381/346

Acoustic resistance:

(under subclass 345) Subject matter further including a material such as foam, wool, fiberglass, etc. or other sound absorbing means.

SEE OR SEARCH CLASS

181, Acoustics,

284+, for sound absorbing panels in sound modifying means.