- All sections
- F - Mechanical engineeringlightingheatingweaponsblasting
- F16J - Pistonscylinderspressure vessels in generalsealings
- F16J 9/20 - Rings with special cross-sectionOil-scraping rings
Patent holdings for IPC class F16J 9/20
Total number of patents in this class: 320
10-year publication summary
|
25
|
36
|
34
|
24
|
36
|
17
|
24
|
19
|
17
|
12
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Federal-Mogul Burscheid GmbH | 283 |
67 |
| Kabushiki Kaisha Riken | 290 |
33 |
| MAHLE International GmbH | 2779 |
30 |
| TPR Co., Ltd. | 160 |
20 |
| Nippon Piston Ring Co., Ltd. | 136 |
18 |
| MAHLE Metal Leve S/A | 157 |
11 |
| Aquarius Engines (A.M.) Ltd. | 37 |
10 |
| NOK Corporation | 2223 |
7 |
| Burckhardt Compression AG | 121 |
5 |
| Man Energy Solutions SE | 256 |
5 |
| Cross Manufacturing Company (1938) Limited | 32 |
4 |
| Mainspring Energy, Inc. | 114 |
4 |
| Caterpillar Inc. | 9604 |
3 |
| Federal-Mogul Friedberg GmbH | 9 |
3 |
| KS Kolbenschmidt GmbH | 153 |
3 |
| LiquidPiston, Inc. | 49 |
3 |
| Tenneco Inc | 251 |
3 |
| GD Energy Products, LLC | 105 |
3 |
| Robert Bosch GmbH | 42784 |
2 |
| GM Global Technology Operations LLC | 15133 |
2 |
| Other owners | 84 |