US PATENT SUBCLASS 181 / 212
.~ Muffler, fluid conducting type

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
212.~ Muffler, fluid conducting type {25}
213  DF  .~.~> Reaction engine type {7}
223  DF  .~.~> Silencer for firearms
224  DF  .~.~> Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type)
225  DF  .~.~> With fan to assist fluid flow
226  DF  .~.~> With adjustable fluid flow
227  DF  .~.~> Pipe-muffler (e.g., tail pipe type)
228  DF  .~.~> With exhaust pipe
229  DF  .~.~> Carburetor, burner, or compressor intake silencer
230  DF  .~.~> Pneumatic type motor (e.g., air hammer, etc.)
231  DF  .~.~> With solid particle separator (e.g., spark arrestor, vacuum cleaner, etc.)
232  DF  .~.~> Separate distinct units serially connected
233  DF  .~.~> Liquid motion silencer {1}
235  DF  .~.~> Underwater discharge
236  DF  .~.~> With muffler cut-out
237  DF  .~.~> With pressure relief safety valve
238  DF  .~.~> Multiple distinct inlets and/or outlets {1}
240  DF  .~.~> Manifold type
241  DF  .~.~> Adjustable muffler (i.e., internal or external parts)
242  DF  .~.~> Mouthpiece (e.g., telephone, microphone, etc.)
243  DF  .~.~> With repair, replacement, or quick disassembly
244  DF  .~.~> Corrosion prevention {2}
247  DF  .~.~> Straight-through passage {4}
256  DF  .~.~> With sound absorbing material {2}
259  DF  .~.~> With disparate fluid mingling {2}
264  DF  .~.~> With baffle or baffle structure {9}

DEFINITION

Classification: 181/212

Muffler, fluid conducting type:

(under subclass 175) Subject matter for conducting or guiding moving liquids or gases, and acting on such moving liquids or gases to attenuate acoustic waves therein, i.e., "mufflers".

(1) Note. Such devices in combination with or forming an element of an art device are with the appropriate art.

(2) Note. See the Index to Classification: "Anti-Noise", "Deadeners" and "Mufflers".

SEE OR SEARCH CLASS

60, Power Plants,

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

137, Fluid Handling, appropriate subclasses for fluid handling devices not otherwise provided for.

138, Pipes and Tubular Conduits, appropriate subclasses, particularly 26+, and 37+ for related structure.