US PATENT SUBCLASS 181 / 220
.~.~.~ With disparate fluid mingling

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}
213  DF  .~.~ Reaction engine type {7}
220.~.~.~ With disparate fluid mingling {1}
221  DF  .~.~.~.~> Liquid

DEFINITION

Classification: 181/220

With disparate fluid mingling:

(under subclass 213) Subject matter in which a fluid is introduced into and mingled with the moving fluids to assist in muffling, as by dilution or condensing the moving fluids.

(1) Note. Chemical treatments of exhaust gases are not in this class. See Class 23, for chemical treatment.

SEE OR SEARCH THIS CLASS, SUBCLASS:

259+, for mufflers having fluids mixed with the exhaust for muffling the sound.

SEE OR SEARCH CLASS

60, Power Plants,

272+, and 685+ for combinations of engines with means for treating exhaust.