GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)

Introduced: September 1968

Description

This classification covers silencers, mufflers, and exhaust systems designed to attenuate noise and control gas flow from various machines, engines, and particularly internal-combustion engines. It encompasses acoustic treatment devices, exhaust manifolds, catalytic converters, particulate filters, and exhaust piping arrangements that manage both sound emissions and pollutant discharge. The scope includes passive silencing technologies, active noise cancellation systems, and combined exhaust treatment solutions for automotive, industrial, and stationary engine applications.

Title

Titles differ between systems:

IPC: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES

CPC: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)

Full Title

Full titles differ between systems:

IPC:

GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES

CPC:

GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)

CPC subdivides this area 5x more granularly than IPC with 26 additional codes.

26 codes are CPC-only extensions.

Note: 26 CPC extensions are marked as secondary classification only.

3 shared codes have differing titles between IPC and CPC.

Child Classifications

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F01N 1/00 Silencing apparatus characterised by method of silencing +1 CPC IPC+CPC Available in IPC and CPC
F01N 11/00 Monitoring or diagnostic devices for exhaust-gas treatment apparatus since 2000 +2 CPC IPC+CPC Available in IPC and CPC
F01N 13/00 Exhaust or silencing apparatus characterised by constructional features since 2010 +7 CPC IPC+CPC Available in IPC and CPC
F01N 2210/00 Combination of methods of silencing 2nd only +3 CPC CPC only CPC only
F01N 2230/00 Combination of silencers and other devices 2nd only +4 CPC CPC only CPC only
F01N 2240/00 Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being 2nd only +20 CPC CPC only CPC only
F01N 2250/00 Combinations of different methods of purification 2nd only +7 CPC CPC only CPC only
F01N 2260/00 Exhaust treating devices having provisions not otherwise provided for 2nd only +13 CPC CPC only CPC only
F01N 2270/00 Mixing air with exhaust gases 2nd only +5 CPC CPC only CPC only
F01N 2290/00 Movable parts or members in exhaust systems for other than for control purposes 2nd only +2 CPC CPC only CPC only
F01N 2310/00 Selection of sound absorbing or insulating material 2nd only +7 CPC CPC only CPC only
F01N 2330/00 Structure of catalyst support or particle filter 2nd only +11 CPC CPC only CPC only
F01N 2340/00 Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the exhaust apparatus; Spatial arrangements of exhaust apparatuses 2nd only +4 CPC CPC only CPC only
F01N 2350/00 Arrangements for fitting catalyst support or particle filter element in the housing 2nd only +2 CPC CPC only CPC only
F01N 2370/00 Selection of materials for exhaust purification 2nd only +3 CPC CPC only CPC only
F01N 2390/00 Arrangements for controlling or regulating exhaust apparatus 2nd only +4 CPC CPC only CPC only
F01N 2410/00 By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device 2nd only +8 CPC CPC only CPC only
F01N 2430/00 Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics 2nd only +5 CPC CPC only CPC only
F01N 2450/00 Methods or apparatus for fitting, inserting or repairing different elements 2nd only +14 CPC CPC only CPC only
F01N 2470/00 Structure or shape of exhaust gas passages, pipes or tubes 2nd only +14 CPC CPC only CPC only