US PATENT SUBCLASS 181 / 213
.~.~ Reaction engine type

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.~.~ Reaction engine type {7}
214  DF  .~.~.~> Upstream (e.g., intake silencer)
215  DF  .~.~.~> With adjustable outlet nozzle {1}
217  DF  .~.~.~> Removable silencer unit (e.g., mobile)
218  DF  .~.~.~> Ground installation silencer
219  DF  .~.~.~> With adjustable internal baffles
220  DF  .~.~.~> With disparate fluid mingling {1}
222  DF  .~.~.~> With sound absorbing material

DEFINITION

Classification: 181/213

Reaction engine type:

(under subclass 212) Subject matter comprising fluid conducting device which muffles or dampens noise emanating from a reaction type engine.

(1) Note. In the subject matter of this subclass type, the engine is usually shrouded and the muffling means are generally along the shroud.

(2) Note. For recited combinations of reaction engines and muffling means, see the reference to Class 60, Power Plants, in the Search Note below.

SEE OR SEARCH CLASS

60, Power Plants, for reaction engines, per se, and

272+, and 685+ for combinations of engines or motors with means for treating the exhaust fluids.