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Top 100 Key Players companies in NOx
by Most Patent Citation in the world in 2022

The NOx top 100 is Discovery PatSnap’ annual ranking of the top 100 Most Patent Citation NOx Key Players in the world. Discovery has identified the top key players, startups & unicorns, fast-growings, news entrants in 2022, ranking from differnt perspectives, including patent filing intensity, academic research capability, news media heat. The company list is generated from various data types.
In atmospheric chemistry, NO x is a generic term for the nitrogen oxides that are most relevant for air pollution, namely nitric oxide (NO) and nitrogen dioxide (NO 2 ). These gases contribute to the formation of smog and acid rain, as well as affecting tropospheric ozone.

Key Players

Fast-growings

Startups & Unicorns

New Entrants

Ranking Year:

2022

2021

2020

2019

2018

Region:

Global

China

Japan

Denmark

United States

United Kingdom

Germany

South Korea

France

Sweden

Switzerland

Ranking:

Most Patent Filings

Highest Patent Value

Most Patent Citation

Most Research Publications

Most Literature Citation

Most Market Reports

Most News Heat

#
Company Name
Region
Tech Topics
Total
1
Toyota Motor Corp.
Aichi, Japan
Sport utility vehicle,Mobile device,Public transport,
...[+2]
patent citation: 15,128
2
Ford Motor Co. A/S
Denmark
patent citation: 4,307
3
Hitachi Ltd.
Tokyo, Japan
Elevator,Electrical equipment,Electric motor,
...[+2]
patent citation: 4,070
4
Mitsubishi Kogyo KK
Japan
patent citation: 3,844
5
Nissan Motor Co., Ltd.
Kanagawa, Japan
Truck,Public transport,Automotive engineering,
...[+2]
patent citation: 3,019
6
General Electric Co.
Massachusetts, United States
Energy management,Turbine,Electronics,
...[+2]
patent citation: 2,317
7
Hino Motors, Ltd.
Tokyo, Japan
Truck,Public transport,Gasoline,
...[+2]
patent citation: 2,295
8
Johnson Matthey Plc
United Kingdom
Diesel particulate filter,Chemical engineering,Cisco Catalyst,
...[+2]
patent citation: 2,213
9
Isuzu Motors Ltd.
Tokyo, Japan
Truck,Public transport,Diesel engine,
...[+2]
patent citation: 2,141
10
Mazda Motor Corp.
Kanagawa, Japan
Automotive engineering,Reciprocating engine,Manual transmission,
...[+2]
patent citation: 1,826
11
Honda Motor Co., Ltd.
Tokyo, Japan
Automotive engineering,Manufacturing engineering,Sport utility vehicle,
...[+2]
patent citation: 1,657
12
Exxon Mobil Corp.
Texas, United States
Petroleum,Petroleum industry,Chemical engineering,
...[+2]
patent citation: 1,618
13
Mobil Corp.
Texas, United States
Petroleum industry,Petroleum,Natural gas
patent citation: 1,618
14
Mitsubishi Motors Corp.
Tokyo, Japan
Sport utility vehicle,Automotive engineering,Electric vehicle,
...[+2]
patent citation: 1,556
15
BASF Corp.
New Jersey, United States
Nutrition,Chemical engineering,Aerospace,
...[+2]
patent citation: 1,440
16
Caterpillar, Inc.
Illinois, United States
Turbine,Construction engineering,Mechanical engineering,
...[+2]
patent citation: 1,356
17
NGK Insulators, Ltd.
Aichi, Japan
Beryllium copper,Industrial engineering,Pottery,
...[+2]
patent citation: 1,312
18
Mitsubishi Fuso Truck & Bus Corp.
Kanagawa, Japan
Truck,Automotive engineering,Chassis
patent citation: 1,210
19
Umicore
Brussels Hoofdstedelijk Gewest, Belgium
Zinc,Precious metal,Catalysis,
...[+2]
patent citation: 1,132
20
G.M. Srl
Vicenza, Italy
Chemical engineering
patent citation: 1,109
21
John Zink Co. LLC
Oklahoma, United States
Control equipment,Hydronics,Combustion system,
...[+2]
patent citation: 1,090
22
International Engine Intellectual Property Co. LLC
Illinois, United States
Intellectual property,Automotive engineering
patent citation: 1,066
23
Robert Bosch GmbH
Baden-Württemberg, Germany
Automotive engineering,Mechanical engineering,Electronics,
...[+2]
patent citation: 1,065
24
Robert Bosch Corp.
Michigan, United States
Shopping mall,Truck
patent citation: 1,065
25
BASF SE
Rheinland-Pfalz, Germany
Agriculture,Petrochemical,Chemical engineering,
...[+2]
patent citation: 1,008
26
Nihon Denso KK
Saitama, Japan
Manufacturing engineering,Mechanical engineering
patent citation: 963
27
UD Trucks Corp.
Saitama, Japan
Truck,Automotive engineering
patent citation: 899
28
Exxon Research & Engineering Co.
United States
patent citation: 895
29
Tokyo Gas Co., Ltd.
Tokyo, Japan
Natural gas,Hydrogen chloride,Petroleum industry,
...[+2]
patent citation: 845
30
Ebara Corp.
Tokyo, Japan
Vacuum pump,Manufacturing engineering,Turbine,
...[+2]
patent citation: 798
31
Toyota Central R&D Labs, Inc.
Aichi, Japan
Semiconductor,Power semiconductor device,System on a chip,
...[+2]
patent citation: 792
32
CDTi Advanced Materials, Inc.
California, United States
Automotive engineering,Cisco Catalyst,Exhaust emission,
...[+2]
patent citation: 772
33
DENSO Corp.
Aichi, Japan
Automotive engineering,Industrial robot,Programmable logic controller,
...[+2]
patent citation: 768
34
N.E. Chemcat Corp.
Tokyo, Japan
Cisco Catalyst,Chemical engineering,Automotive catalyst,
...[+2]
patent citation: 754
35
Volkswagen Group of America, Inc.
Michigan, United States
Truck,Automotive engineering,Automotive industry
patent citation: 752
36
Volkswagenwerk AG
Germany
patent citation: 752
37
TOSHIBA Corp.
Tokyo, Japan
Semiconductor,Computer hardware,Electronics,
...[+2]
patent citation: 747
38
Mercedes-Benz Group AG
Baden-Württemberg, Germany
Automotive engineering,Electric vehicle,Hybrid vehicle,
...[+2]
patent citation: 735
39
The Babcock & Wilcox Co.
Ohio, United States
Electronics,Flue-gas desulfurization,Control equipment,
...[+2]
patent citation: 723
40
Daimier AG
Germany
Truck,Chassis
patent citation: 721
41
Osaka Gas Co., Ltd.
Osaka, Japan
Natural gas,Activated carbon,Petroleum industry,
...[+2]
patent citation: 720
42
W.R. Grace & Co.
United States
Coating,Computer hardware,Petrochemical,
...[+2]
patent citation: 686
43
Hitachi Zosen Corp.
Osaka, Japan
Mechanical engineering,Waste-to-energy,Environmental protection,
...[+2]
patent citation: 671
44
Eaton Corp.
DUBLIN, Ireland
Automotive engineering,Power transmission,Electrical equipment,
...[+2]
patent citation: 671
45
Air Products & Chemicals, Inc.
Pennsylvania, United States
Industrial gas,Chemical engineering,Helium,
...[+2]
patent citation: 666
46
Solar Turbines, Inc.
California, United States
Turbine,Petroleum industry,Power transmission,
...[+2]
patent citation: 616
47
Kawasaki Heavy Industries Ltd.
Kyoto, Japan
Turbine,Mechanical engineering,Manufacturing engineering,
...[+2]
patent citation: 607
48
Panasonic Holdings Corp.
Osaka, Japan
Semiconductor,Industrial engineering,Electronics,
...[+2]
patent citation: 605
49
Matsushita Electronics Corp.
Osaka, Japan
Electronics,Computer hardware,DVD player,
...[+2]
patent citation: 605
50
Corning, Inc.
New York, United States
Telecommunications,Computer hardware,Electronics,
...[+2]
patent citation: 584
51
Hyundai Motor Co., Ltd.
South Korea
Public transport,Automotive engineering,Truck,
...[+2]
patent citation: 584
52
Shell Oil Co.
Texas, United States
Petrochemical,Nanomaterials,Chemical engineering,
...[+2]
patent citation: 551
53
Kobe Steel, Ltd.
Hyogo, Japan
Welding,Electronics,Mining engineering,
...[+2]
patent citation: 533
54
Mitsubishi Power Ltd.
Kanagawa, Japan
Turbine,Control system,Renewable energy,
...[+2]
patent citation: 521
55
NGK SPARK PLUG CO., LTD.
Aichi, Japan
Spark plug,Automotive engineering,Ceramic art,
...[+2]
patent citation: 514
56
Aptiv Plc
DUBLIN, Ireland
Electric vehicle,Automotive engineering,Software,
...[+2]
patent citation: 508
57
Delphi Technology, Inc.
Massachusetts, United States
Software,Business intelligence,Systems design,
...[+2]
patent citation: 508
58
Honeywell International, Inc.
North Carolina, United States
Aerospace,Electronics,Market research,
...[+2]
patent citation: 495
59
Nippon Shokubai Co., Ltd.
Tokyo, Japan
Polymer,Acrylic acid,Chemical engineering,
...[+2]
patent citation: 494
60
Miura Co., Ltd.
Tokyo, Japan
Boiler (power generation),Water-tube boiler,Refrigeration,
...[+2]
patent citation: 480
61
Praxair S.T. Technology, Inc.
Connecticut, United States
Information technology consulting,Systems design,Coating,
...[+2]
patent citation: 478
62
IHI Power Systems Co., Ltd.
Tokyo, Japan
Turbine,Gas engine,Manufacturing engineering,
...[+2]
patent citation: 472
63
Siemens AG
Bayern, Germany
Power transmission,Electronics,Turbine,
...[+2]
patent citation: 471
64
Siemens SA
Madrid, Spain
Scientific Control,Telecommunications,Turbine,
...[+1]
patent citation: 471
65
Koch Engineering Co., Inc.
Kansas, United States
Petroleum,Petroleum industry
patent citation: 460
66
Cummins Filtration SARL
France
Mechanical engineering,Manufacturing engineering
patent citation: 458
67
Komatsu Ltd.
Tokyo, Japan
Environmental engineering,Construction engineering,Heavy equipment,
...[+2]
patent citation: 451
68
BASF Catalysts LLC
New Jersey, United States
Polyolefin,Mica,Metal,
...[+2]
patent citation: 451
69
Mitsubishi Electric Engineering Co., Ltd.
Tokyo, Japan
patent citation: 445
70
NIPPON STEEL Stainless Steel Corp.
Tokyo, Japan
Mill,Metal,Mining engineering,
...[+1]
patent citation: 440
71
ClearSign Technologies Corp.
Washington, United States
Petroleum industry,Chemical reaction,Combustion system,
...[+2]
patent citation: 428
72
Powerspan Corp.
New Hampshire, United States
Fossil fuel,Clean Air Act,Acid rain,
...[+2]
patent citation: 423
73
Micron Technology, Inc.
Idaho, United States
Semiconductor,Computer hardware,Solid-state drive,
...[+2]
patent citation: 410
74
NKK Corp.
Tokyo, Japan
Natural resource management,Mining engineering
patent citation: 398
75
Yanmar Co., Ltd.
Osaka, Japan
Diesel engine,Electronics,Tractor,
...[+2]
patent citation: 396
76
Kongsberg Maritime Sweden AB
Sweden
Marine propulsion,National security,Aerospace
patent citation: 388
77
GE Energy & Environmental Research Corp.
California, United States
patent citation: 384
78
United Technologies
Connecticut, United States
Aerospace,Public transport,Building automation,
...[+2]
patent citation: 375
79
United-Tech, Inc.
Oklahoma, United States
Yeast,Telecommunications,Chemical treatment,
...[+2]
patent citation: 375
80
Calgon Carbon Corp.
Pennsylvania, United States
Activated carbon,Carbon,Industrial engineering,
...[+2]
patent citation: 371
81
Siemens Energy, Inc.
United States
HVAC,Offshore wind power,Wind power,
...[+1]
patent citation: 361
82
Mitsubishi Hitachi Power Systems
Kanagawa, Japan
Control system
patent citation: 360
83
MAN Truck & Bus SE
Germany
Truck,Internet of Things,Automotive engineering
patent citation: 339
84
MAN Truck & Bus
Bayern, Germany
Truck,Public transport,Turbomachinery,
...[+2]
patent citation: 339
85
Energy & Environmental Research Corp.
California, United States
Nitrogen oxide
patent citation: 334
86
PQ Corp.
Pennsylvania, United States
Synthetic rubber,Chemical engineering,Silicate,
...[+2]
patent citation: 333
87
Texaco Development Corp.
Texas, United States
patent citation: 332
88
ASEC Manufacturing General Partnership
OK, US
General partnership,Automation,Manufacturing engineering,
...[+2]
patent citation: 322
89
Peugeot Citroën Automobiles SA
Île-de-France, France
Automotive engineering
patent citation: 314
90
Mitsui E&S Holdings Co., Ltd.
Tokyo, Japan
Public transport,Hydrogen compressor,Reciprocating compressor,
...[+2]
patent citation: 309
91
IBIDEN Co., Ltd.
Gifu, Japan
Electronics,Semiconductor,Asphalt,
...[+2]
patent citation: 302
92
IHI Corp.
Tokyo, Japan
Turbocharger,Manufacturing engineering,Turbine,
...[+2]
patent citation: 292
93
Idemitsu Kosan Co., Ltd.
Tokyo, Japan
Petrochemical,Lubricant,Petroleum,
...[+2]
patent citation: 287
94
Daimler-Benz Aerospace AG
Germany
Construction engineering,Civil engineering,Mechanical engineering,
...[+1]
patent citation: 287
95
VTR LS Management LLC
Kentucky, United States
patent citation: 287
96
GEO2 Technologies, Inc.
Massachusetts, United States
Microstructure,Biotechnology
patent citation: 269
97
Yamaha Motor Co., Ltd.
Shizuoka, Japan
Robotics,Industrial robot,Automotive engineering,
...[+2]
patent citation: 268
98
Norks Hydro ASA
Oslo, Norway
Aluminium,Precious metal,Mining engineering
patent citation: 268
99
Ricoh Co., Ltd.
Tokyo, Japan
Digital media,Data visualization,Thermal paper,
...[+2]
patent citation: 255
100
Sumitomo Metal Mining Co., Ltd.
Tokyo, Japan
Nickel,Mining engineering,Natural resource management,
...[+2]
patent citation: 253

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