US PATENT SUBCLASS 181 / 175
SOUND-MODIFYING MEANS

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175SOUND-MODIFYING MEANS {12}
176  DF  .~> Lens
177  DF  .~> Intensifying horn {11}
196  DF  .~> Within tubular means {1}
198  DF  .~> Housing or enclosure (e.g., sound confining and absorbing) {2}
206  DF  .~> By wave interference
207  DF  .~> Mechanical vibration attenuator {2}
210  DF  .~> Sound absorbing fence or screen (e.g., jet engine or vehicle noise)
211  DF  .~> Combined
212  DF  .~> Muffler, fluid conducting type {25}
284  DF  .~> Sound absorbing panels {8}
295  DF  .~> Space absorbers
296  DF  .~> Methods

DEFINITION

Classification: 181/175

(under the class definition) Subject matter for (1) deviation of the direction of an acoustical wave, (2) blocking of an acoustical wave, or (3) the modification of the character or property of an acoustical wave.