- 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: 1268
10-year publication summary
|
187
|
177
|
140
|
121
|
76
|
75
|
39
|
41
|
31
|
16
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Cummins Emission Solutions, Inc. | 579 |
74 |
| Ford Global Technologies, LLC | 21509 |
58 |
| Toyota Motor Corporation | 35772 |
49 |
| Yanmar Power Technology Co., Ltd. | 580 |
39 |
| Scania CV AB | 2409 |
31 |
| Caterpillar Inc. | 10267 |
28 |
| Volvo Truck Corporation | 3911 |
28 |
| Cummins Inc. | 2632 |
27 |
| Tenneco Automotive Operating Company Inc. | 455 |
27 |
| Komatsu Ltd. | 4723 |
26 |
| Johnson Matthey Public Limited Company | 1768 |
26 |
| Volkswagen AG | 7461 |
24 |
| Continental Automotive GmbH | 4503 |
22 |
| Isuzu Motors Limited | 2323 |
21 |
| Umicore AG & Co. KG | 853 |
21 |
| GM Global Technology Operations LLC | 16124 |
20 |
| Vitesco Technologies GmbH | 2397 |
19 |
| 3m Innovative Properties Company | 17478 |
18 |
| Purem GmbH, Formerly, Eberspächer Exhaust Technology GmbH | 309 |
18 |
| Watlow Electric Manufacturing Company | 577 |
17 |
| Other owners | 675 |