absorption or adsorption, and filtering

Industry

CPC
F01N2250/14

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Parent Industries

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F01Engines F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES F01N2250/00Combinations of different methods of purification

Current Industry

F01N2250/14absorption or adsorption, and filtering

Industries

Patents Grantslast 30 patents

Information Patent Grant
Lean NOx trap plus low temperature NOx adsorber system for low temp...
- Patent number 12,129,779
- Issue date Oct 29, 2024
- BASF Corporation
- Matthew T. Caudle
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Logic for improved delta pressure based soot estimation on low rest...
- Patent number 11,867,112
- Issue date Jan 9, 2024
- International Engine Intellectual Property Company, LLC
- Paul Boon Charintranond
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Single brick SCR/ASC/PNA/DOC close-coupled catalyst
- Patent number 11,857,925
- Issue date Jan 2, 2024
- Johnson Matthey Public Limited Company
- Hai-Ying Chen
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Methods and systems for exhaust emission control
- Patent number 10,954,835
- Issue date Mar 23, 2021
- Ford Global Technologies, LLC
- Christine Lambert
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Single brick SCR/ASC/PNA/DOC close-coupled catalyst
- Patent number 10,926,221
- Issue date Feb 23, 2021
- Johnson Matthey Public Limited Company
- Hai-Ying Chen
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Variable-position mixer for an exhaust gas after-treatment system
- Patent number 10,428,712
- Issue date Oct 1, 2019
- GM Global Technology Operations LLC
- Claudio Ciaravino
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Reagent dosing system and method of dosing reagent
- Patent number 10,107,164
- Issue date Oct 23, 2018
- DELPHI TECHNOLOGIES IP LIMITED
- Philip J. G. Dingle
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Exhaust gas aftertreatment component with an HC adsorber function a...
- Patent number 9,567,887
- Issue date Feb 14, 2017
- Volkswagen Aktiengesellschaft
- Valeri Seiler
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
System and method of purifying exhaust gas provided with lean NOx t...
- Patent number 9,551,252
- Issue date Jan 24, 2017
- Hyundai Motor Company
- Jin Woo Park
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Exhaust system for a lean burn IC engine
- Patent number 9,527,031
- Issue date Dec 27, 2016
- Johnson Matthey Public Limited Company
- Guy Richard Chandler
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Work machine
- Patent number 9,453,326
- Issue date Sep 27, 2016
- Hitachi Construction Machinery Co., Ltd.
- Akira Shimohira
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Emissions treatment system with lean NOx trap
- Patent number 9,453,443
- Issue date Sep 27, 2016
- BASF Corporation
- Sanath V. Kumar
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Reagent dosing system and method of dosing reagent
- Patent number 9,279,351
- Issue date Mar 8, 2016
- Delphi International Operations Luxembourg S.A.R.L.
- Philip J. G. Dingle
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust purification system of internal combustion engine
- Patent number 9,109,491
- Issue date Aug 18, 2015
- Toyota Jidosha Kabushiki Kaisha
- Yuki Bisaiji
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust gas aftertreatment installation and method
- Patent number 9,057,307
- Issue date Jun 16, 2015
- Daimler AG
- Brigitte Bandl-Konrad
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Reagent dosing system and method of dosing reagent
- Patent number 8,899,021
- Issue date Dec 2, 2014
- Delphi International Operations Luxembourg S.A.R.L.
- Philip J. G. Dingle
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust system for a lean burn ic engine
- Patent number 8,756,926
- Issue date Jun 24, 2014
- Johnson Matthey Public Limited Company
- Guy Richard Chandler
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust-gas aftertreatment system with catalytically active wall-fl...
- Patent number 8,475,753
- Issue date Jul 2, 2013
- Umicore AG & Co. KG
- Stephan Eckhoff
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
System and method for reducing NOx emissions in an apparatus having...
- Patent number 8,434,295
- Issue date May 7, 2013
- Ford Global Technologies, LLC
- Thomas Leone
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Exhaust gas purification system for an internal combustion engine
- Patent number 8,347,608
- Issue date Jan 8, 2013
- Toyota Jidosha Kabushiki Kaisha
- Kenichi Tsujimoto
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Method for controlling the temperature of the exhaust gases of a th...
- Patent number 8,302,381
- Issue date Nov 6, 2012
- Renault S.A.S.
- Pascal Barrillon
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust gas treating apparatus and treating method
- Patent number 8,297,045
- Issue date Oct 30, 2012
- Osaka Prefecture University Public Corporation
- Keiichiro Yoshida
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust gas aftertreatment installation and method
- Patent number 8,297,046
- Issue date Oct 30, 2012
- Daimler AG
- Brigitte Bandl-Konrad
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust purification system of internal combustion engine
- Patent number 8,276,369
- Issue date Oct 2, 2012
- Toyota Jidosha Kabushiki Kaisha
- Hiromasa Nishioka
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Exhaust gas purification device
- Patent number 8,181,447
- Issue date May 22, 2012
- Toyota Jidosha Kabushiki Kaisha
- Jun Tahara
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Gasoline engine emissions treatment systems having particulate traps
- Patent number 8,173,087
- Issue date May 8, 2012
- BASF Corporation
- Junmei Wei
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust gas purification system for internal combustion engine
- Patent number 8,079,213
- Issue date Dec 20, 2011
- Toyota Jidosha Kabushiki Kaisha
- Kenichi Tsujimoto
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust system for a lean burn internal combustion engine
- Patent number 7,832,203
- Issue date Nov 16, 2010
- Johnson Matthey Public Limited Company
- Andrew Francis Chiffey
- G01 - MEASURING TESTING
Information Patent Grant
Exhaust gas aftertreatment installation and method
- Patent number 7,814,747
- Issue date Oct 19, 2010
- Daimler AG
- Brigitte Bandl-Konrad
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Exhaust gas purification system for hybrid vehicle
- Patent number 7,748,214
- Issue date Jul 6, 2010
- Nissan Motor Co., Ltd.
- Hiroshi Ishii
- B60 - VEHICLES IN GENERAL

Patents Applicationslast 30 patents

Information Patent Application
Post-Combustion Engine Exhaust Gases Absorber
- Publication number 20240392712
- Publication date Nov 28, 2024
- Nkrumah Fong
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
LEAN NOx TRAP PLUS LOW TEMPERATURE NOx ADSORBER SYSTEM FOR LOW TEMP...
- Publication number 20230003150
- Publication date Jan 5, 2023
- BASF Corporation
- Matthew T. Caudle
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
SINGLE BRICK SCR/ASC/PNA/DOC CLOSE-COUPLED CATALYST
- Publication number 20210162344
- Publication date Jun 3, 2021
- Johnson Matthey Public Limited Company
- Hai-Ying CHEN
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
METHODS AND SYSTEMS FOR EXHAUST EMISSION CONTROL
- Publication number 20200291839
- Publication date Sep 17, 2020
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Christine Lambert
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
AFTERTREATMENT SYSTEM WITH LEAN NOx TRAP FILTER
- Publication number 20190383183
- Publication date Dec 19, 2019
- GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Andrea Pannuzzo
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
VARIABLE-POSITION MIXER FOR AN EXHAUST GAS AFTER-TREATMENT SYSTEM
- Publication number 20190063292
- Publication date Feb 28, 2019
- GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Claudio Ciaravino
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
METHOD OF OPERATING AN AUTOMOTIVE SYSTEM
- Publication number 20170044946
- Publication date Feb 16, 2017
- GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Gennaro MERLINO
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
SYSTEM OF PURIFYING EXHAUST GAS PROVIDED WITH LEAN NOx TRAP AND SEL...
- Publication number 20160290199
- Publication date Oct 6, 2016
- FEV GMBH
- Jin Woo PARK
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
EXHAUST GAS AFTERTREATMENT COMPONENT WITH AN HC ADSORBER FUNCTION A...
- Publication number 20140373515
- Publication date Dec 25, 2014
- Volkswagen Aktiengesellschaft
- Valeri Seiler
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
REAGENT DOSING SYSTEM AND METHOD OF DOSING REAGENT
- Publication number 20140311128
- Publication date Oct 23, 2014
- PHILIP J.G. DINGLE
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
Exhaust System for a Lean Burn IC Engine
- Publication number 20140241950
- Publication date Aug 28, 2014
- Johnson Matthey Public Limited Company
- Guy Richard CHANDLER
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE
- Publication number 20130315790
- Publication date Nov 28, 2013
- TOYOTA JIDOSHA KABUSHIKI KAISHA
- Yuki Bisaiji
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
Exhaust Gas Aftertreatment Installation and Method
- Publication number 20130011313
- Publication date Jan 10, 2013
- Daimier AG
- Brigitte BANDL-KONRAD
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
EXHAUST EMISSION CONTROL DEVICE
- Publication number 20120321523
- Publication date Dec 20, 2012
- HINO MOTORS, LTD.
- Masatoshi Shimoda
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
EXHAUST GAS AFTER-TREATMENT SYSTEM
- Publication number 20120247088
- Publication date Oct 4, 2012
- Douglas Munroe Beall
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
APPARATUS COMPRISING LEAN BURN IC ENGINE AND AN EXHAUST SYSTEM THER...
- Publication number 20120233985
- Publication date Sep 20, 2012
- Johnson Matthey Public Limited Company
- Hai-Ying Chen
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
EXHAUST-GAS AFTERTREATMENT SYSTEM WITH CATALYTICALLY ACTIVE WALL-FL...
- Publication number 20120148464
- Publication date Jun 14, 2012
- Umicore AG & Co. KG
- Stephan Eckhoff
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
EXHAUST EMISSION PURIFYING APPARATUS
- Publication number 20110239633
- Publication date Oct 6, 2011
- UD TRUCKS CORPORATION
- Nobuhiko Masaki
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
EXHAUST SYSTEM FOR A LEAN BURN IC ENGINE
- Publication number 20110179777
- Publication date Jul 28, 2011
- Johnson Matthey Public Limited Company
- Guy Richard Chandler
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
SYSTEM AND METHOD FOR TREATING DIESEL EXHAUST GASES
- Publication number 20110016848
- Publication date Jan 27, 2011
- MACK TRUCKS, INC.
- Jeffrey A. Brooks
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
EXHAUST GAS TREATING APPARATUS AND TREATING METHOD
- Publication number 20110011059
- Publication date Jan 20, 2011
- Osaka Prefecture University Public Corporation
- Keiichiro Yoshida
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
Exhaust Gas Aftertreatment Installation and Method
- Publication number 20110005204
- Publication date Jan 13, 2011
- Daimler AG
- Brigitte Bandl-Konrad
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
METHOD FOR CONTROLLING THE TEMPERATURE OF THE EXHAUST GASES OF A TH...
- Publication number 20100307137
- Publication date Dec 9, 2010
- Renault S.A.S.
- Pascal Barrillon
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE
- Publication number 20100257847
- Publication date Oct 14, 2010
- TOYOTA JIDOSHA KABUSHIKI KAISHA
- Hiromasa Nishioka
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
Emissions Treatment System With Lean NOx Trap
- Publication number 20100236224
- Publication date Sep 23, 2010
- BASF CATALYSTS LLC
- Sanath V. Kumar
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
Exhaust gas after treatment assembly
- Publication number 20100186394
- Publication date Jul 29, 2010
- Caterpillar Inc.
- Benjamin Harrison
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
EXHAUST GAS PURIFICATION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE
- Publication number 20100132336
- Publication date Jun 3, 2010
- Toyota Jidosha Kabushiki Kaisha
- Kenichi Tsujimoto
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
EXHAUST GAS PURIFICATION DEVICE
- Publication number 20090301063
- Publication date Dec 10, 2009
- TOYOTA JIDOSHA KABUSHIKI KAISHA
- Jun Tahara
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
REAGENT DOSING SYSTEM AND METHOD OF DOSING REAGENT
- Publication number 20090301067
- Publication date Dec 10, 2009
- Delphi Technologies, Inc.
- PHILIP J.G. DINGLE
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
Exhaust Gas Aftertreatment System and Exhaust Gas Cleaning Method
- Publication number 20090205322
- Publication date Aug 20, 2009
- Daimler AG
- Tillmann Braun
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES

absorption or adsorption, and filtering

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Lean NOx trap plus low temperature NOx adsorber system for low temp...

Logic for improved delta pressure based soot estimation on low rest...

Single brick SCR/ASC/PNA/DOC close-coupled catalyst

Methods and systems for exhaust emission control

Single brick SCR/ASC/PNA/DOC close-coupled catalyst

Variable-position mixer for an exhaust gas after-treatment system

Reagent dosing system and method of dosing reagent

Exhaust gas aftertreatment component with an HC adsorber function a...

System and method of purifying exhaust gas provided with lean NOx t...

Exhaust system for a lean burn IC engine

Work machine

Emissions treatment system with lean NOx trap

Reagent dosing system and method of dosing reagent

Exhaust purification system of internal combustion engine

Exhaust gas aftertreatment installation and method

Reagent dosing system and method of dosing reagent

Exhaust system for a lean burn ic engine

Exhaust-gas aftertreatment system with catalytically active wall-fl...

System and method for reducing NOx emissions in an apparatus having...

Exhaust gas purification system for an internal combustion engine

Method for controlling the temperature of the exhaust gases of a th...

Exhaust gas treating apparatus and treating method

Exhaust gas aftertreatment installation and method

Exhaust purification system of internal combustion engine

Exhaust gas purification device

Gasoline engine emissions treatment systems having particulate traps

Exhaust gas purification system for internal combustion engine

Exhaust system for a lean burn internal combustion engine

Exhaust gas aftertreatment installation and method

Exhaust gas purification system for hybrid vehicle

Patents Applicationslast 30 patents

Post-Combustion Engine Exhaust Gases Absorber

LEAN NOx TRAP PLUS LOW TEMPERATURE NOx ADSORBER SYSTEM FOR LOW TEMP...

SINGLE BRICK SCR/ASC/PNA/DOC CLOSE-COUPLED CATALYST

METHODS AND SYSTEMS FOR EXHAUST EMISSION CONTROL

AFTERTREATMENT SYSTEM WITH LEAN NOx TRAP FILTER

VARIABLE-POSITION MIXER FOR AN EXHAUST GAS AFTER-TREATMENT SYSTEM

METHOD OF OPERATING AN AUTOMOTIVE SYSTEM

SYSTEM OF PURIFYING EXHAUST GAS PROVIDED WITH LEAN NOx TRAP AND SEL...

EXHAUST GAS AFTERTREATMENT COMPONENT WITH AN HC ADSORBER FUNCTION A...

REAGENT DOSING SYSTEM AND METHOD OF DOSING REAGENT

Exhaust System for a Lean Burn IC Engine

EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE

Exhaust Gas Aftertreatment Installation and Method

EXHAUST EMISSION CONTROL DEVICE

EXHAUST GAS AFTER-TREATMENT SYSTEM

APPARATUS COMPRISING LEAN BURN IC ENGINE AND AN EXHAUST SYSTEM THER...

EXHAUST-GAS AFTERTREATMENT SYSTEM WITH CATALYTICALLY ACTIVE WALL-FL...

EXHAUST EMISSION PURIFYING APPARATUS

EXHAUST SYSTEM FOR A LEAN BURN IC ENGINE

SYSTEM AND METHOD FOR TREATING DIESEL EXHAUST GASES

EXHAUST GAS TREATING APPARATUS AND TREATING METHOD

Exhaust Gas Aftertreatment Installation and Method

METHOD FOR CONTROLLING THE TEMPERATURE OF THE EXHAUST GASES OF A TH...

EXHAUST PURIFICATION SYSTEM OF INTERNAL COMBUSTION ENGINE

Emissions Treatment System With Lean NOx Trap

Exhaust gas after treatment assembly

EXHAUST GAS PURIFICATION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE

EXHAUST GAS PURIFICATION DEVICE

REAGENT DOSING SYSTEM AND METHOD OF DOSING REAGENT

Exhaust Gas Aftertreatment System and Exhaust Gas Cleaning Method