CPC Subgroup
F01N 3/021 by means of filters
Full Title
Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust (electric control F01N9/00; monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00) > for cooling, or for removing solid constituents of, exhaust (by means of electric or electrostatic separators F01N3/01 ) > by means of filters
10 direct subcodes
Child Classifications
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- F01N 3/022 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N 3/023 using means for regenerating the filters, e.g. by burning trapped particles
- F01N 3/031 having means for by-passing filters, e.g. when clogged or during cold engine start
- F01N 3/033 in combination with other devices
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