US PATENT SUBCLASS 181 / 291
.~.~.~ With membrane outer layer

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  DF  .~.~ Multilayer panel or wall structure {2}
291.~.~.~ With membrane outer layer

DEFINITION

Classification: 181/291

With membrane outer layer:

(under subclass 290) Subject matter having a front or rear facing formed as a coating, foil, or film.