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)

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.

33 direct subcodes

Child Classifications

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

Top Applicants

Top 10 applicants by patent filingsfor class F01, 2013–2023, worldwide · Source: EPO PATSTAT

GE (GENERAL ELECTRIC COMPANY) US 9,989
UNITED TECHNOLOGIES CORPORATION (UTC) US 8,110
SAFRAN AIRCRAFT ENGINES FR 6,248
HYUNDAI MOTOR COMPANY KR 4,530
SIEMENS DE 4,461
FORD GLOBAL TECHNOLOGIES US 4,029
RAYTHEON TECHNOLOGIES CORPORATION US 3,947
TOYOTA MOTOR CORPORATION JP 3,734
GE (GENERAL ELECTRIC COMPANY) 3,415
SCHAEFFLER TECHNOLOGIES & COMPANY DE 3,063