US PATENT SUBCLASS 181 / 267
.~.~.~ Coaxial foraminous walls
Current as of:
June, 1999
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181 /
HD
ACOUSTICS
175
DF
SOUND-MODIFYING MEANS
{12}
212
DF
.~ Muffler, fluid conducting type {25}
264
DF
.~.~ With baffle or baffle structure {9}
267
.~.~.~ Coaxial foraminous walls
DEFINITION
Classification: 181/267
Coaxial foraminous walls:
(under subclass 264) Subject matter in which are provided a plurality of coaxial cylindrical chambers having fluid pervious walls through which the fluid flows in a radial direction into the atmosphere.