US PATENT SUBCLASS 181 / 290
.~.~ Multilayer panel or wall structure

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
284  DF  .~ Sound absorbing panels {8}
290.~.~ Multilayer panel or wall structure {2}
291  DF  .~.~.~> With membrane outer layer
292  DF  .~.~.~> With perforated or porous face and honeycomb-like core

DEFINITION

Classification: 181/290

Multilayer panel or wall structure:

(under subclass 284) Subject matter comprising more than one layer of sound attenuating material.