US PATENT SUBCLASS 181 / 177
.~ Intensifying horn

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
177.~ Intensifying horn {11}
178  DF  .~.~> Collapsible
179  DF  .~.~> With particular mounting structure
180  DF  .~.~> Material
181  DF  .~.~> With vibratory filaments
182  DF  .~.~> With resonant chamber {1}
184  DF  .~.~> Having apertures in walls
185  DF  .~.~> With sound-path restriction {1}
187  DF  .~.~> Plural intensifying portions {1}
189  DF  .~.~> Multisection housing {1}
191  DF  .~.~> With external sound deflector
192  DF  .~.~> Particular shape of the horn {3}

DEFINITION

Classification: 181/177

(under subclass 175) Subject matter comprising a hollow member open at opposite ends and having a progressively increasing cross sectional area from one end to the other. Sound is introduced at the smaller open end and emerges increased in loudness at the larger open end.

(1) Note. A device which both increases the loudness of the sound and modifies the quality or tone of the sound is properly classified here.

SEE OR SEARCH THIS CLASS, SUBCLASS:

129, for a sound intensifying horn which is designed to have contact with the human body.

152, for a horn and sound diaphragm in an enclosure.

159, for a horn and a sound producing diaphragm.