US PATENT SUBCLASS 381 / 413
.~.~.~ Having damping

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}
412  DF  .~.~ Magnetic circuit {8}
413.~.~.~ Having damping

DEFINITION

Classification: 381/413

Having damping:

(under subclass 412) Subject matter including a sound or vibration absorbing means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

353, for acoustic damping or attenuating resonator in acoustic enclosure.

354, for absorbing or attenuating element in acoustic enclosure.

372, for mechanical or acoustic sound attenuation in headphone.