- All sections
- F - Mechanical engineeringlightingheatingweaponsblasting
- F01N - Gas-flow silencers or exhaust apparatus for machines or engines in generalgas-flow silencers or exhaust apparatus for internal-combustion engines
- F01N 3/021 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
Patent holdings for IPC class F01N 3/021
Total number of patents in this class: 1248
10-year publication summary
|
160
|
187
|
177
|
140
|
121
|
76
|
75
|
38
|
38
|
20
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cummins Emission Solutions, Inc. | 541 |
70 |
| Ford Global Technologies, LLC | 20605 |
58 |
| Toyota Motor Corporation | 32331 |
46 |
| Yanmar Power Technology Co., Ltd. | 580 |
39 |
| Scania CV AB | 2394 |
30 |
| Caterpillar Inc. | 9558 |
28 |
| Volvo Truck Corporation | 3418 |
28 |
| Komatsu Ltd. | 4556 |
26 |
| Cummins Inc. | 2590 |
25 |
| Volkswagen AG | 7347 |
24 |
| Johnson Matthey Public Limited Company | 1862 |
23 |
| Continental Automotive GmbH | 4775 |
22 |
| Umicore AG & Co. KG | 854 |
22 |
| 3m Innovative Properties Company | 17819 |
21 |
| Isuzu Motors Limited | 2254 |
21 |
| GM Global Technology Operations LLC | 15088 |
20 |
| Tenneco Automotive Operating Company Inc. | 622 |
20 |
| Vitesco Technologies GmbH | 2604 |
20 |
| Purem GmbH, Formerly, Eberspächer Exhaust Technology GmbH | 307 |
18 |
| Watlow Electric Manufacturing Company | 581 |
17 |
| Other owners | 670 |