US PATENT SUBCLASS 181 / 292
.~.~.~ With perforated or porous face and honeycomb-like core

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}
292.~.~.~ With perforated or porous face and honeycomb-like core

DEFINITION

Classification: 181/292

With perforated or porous face and honeycomb-like core:

(under subclass 290) Subject matter having at least one porous or perforated layer and at least one honeycomb-like layer.

(1) Note. Typically, such products are used as reaction engine duct liners.