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

Introduced: September 1968

Classification Context

Section:: MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:: MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
Subclass:: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES

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.

Filing statistics

IPC subclass F01N recorded 101,522 patent applications worldwide between 2013 and 2023. Annual filings declined from 9,000 in 2013 to 6,085 in 2023 (-32%), peaking at 11,219 applications in 2017. The most active applicants in class F01 are GE (GENERAL ELECTRIC COMPANY) (8,496 applications), UNITED TECHNOLOGIES CORPORATION (UTC) (7,291 applications) and SAFRAN AIRCRAFT ENGINES (5,503 applications).

Source: EPO PATSTAT, worldwide filings

Related Keywords

preventing AIR pollution by treating engine exhaustcompositions for laying DUST from engine exhaustEXHAUST apparatus for internal-combustion enginestreating internal-combustion engine EXHAUSTtreating internal-combustion engine exhaust GAS(ES)exhaust MUFFLERS for internal-combustion enginesexhaust SILENCERS for internal-combustion engines

7 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 3/00 Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
F01N 5/00 Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
F01N 9/00 Electrical control of exhaust gas treating apparatus
F01N 99/00 Subject matter not provided for in other groups of this subclass

Top Applicants

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

GE (GENERAL ELECTRIC COMPANY) US 8,496
UNITED TECHNOLOGIES CORPORATION (UTC) US 7,291
SAFRAN AIRCRAFT ENGINES FR 5,503
TOYOTA MOTOR CORPORATION 4,556
SIEMENS DE 3,992
HYUNDAI MOTOR COMPANY KR 3,929
RAYTHEON TECHNOLOGIES CORPORATION US 3,534
FORD GLOBAL TECHNOLOGIES US 3,407
TOYOTA MOTOR CORPORATION JP 3,042
WEICHAI POWER COMPANY 2,888