- All sections
- F - Mechanical engineering; lighting; heating; weapons; blasting
- F16J - Pistons; cylinders; pressure vessels in general; sealings
- F16J 9/20 - Rings with special cross-section; Oil-scraping rings
Patent holdings for IPC class F16J 9/20
Total number of patents in this class: 306
10-year publication summary
|
27
|
25
|
36
|
35
|
24
|
38
|
18
|
25
|
20
|
4
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Federal-Mogul Burscheid GmbH | 284 |
64 |
| Kabushiki Kaisha Riken | 265 |
32 |
| MAHLE International GmbH | 2670 |
27 |
| Nippon Piston Ring Co., Ltd. | 131 |
19 |
| TPR Co., Ltd. | 141 |
16 |
| MAHLE Metal Leve S/A | 160 |
11 |
| Aquarius Engines (A.M.) Ltd. | 35 |
10 |
| NOK Corporation | 2108 |
7 |
| Burckhardt Compression AG | 116 |
5 |
| Man Energy Solutions SE | 274 |
5 |
| Cross Manufacturing Company (1938) Limited | 28 |
4 |
| Mainspring Energy, Inc. | 98 |
4 |
| Federal-Mogul Friedberg GmbH | 10 |
3 |
| KS Kolbenschmidt GmbH | 164 |
3 |
| LiquidPiston, Inc. | 41 |
3 |
| Montabert | 64 |
3 |
| Trelleborg Sealing Solutions Germany GmbH | 183 |
3 |
| Tenneco Inc | 274 |
3 |
| GD Energy Products, LLC | 78 |
3 |
| Robert Bosch GmbH | 40953 |
2 |
| Other owners | 79 |