- All sections
- F - Mechanical engineering; lighting; heating; weapons; blasting
- F02F - Cylinders, pistons, or casings for combustion engines; arrangements of sealings in combustion engines
- F02F 5/00 - Piston rings, e.g. associated with piston crown
Patent holdings for IPC class F02F 5/00
Total number of patents in this class: 275
10-year publication summary
|
26
|
17
|
25
|
25
|
23
|
15
|
16
|
12
|
10
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kabushiki Kaisha Riken | 274 |
98 |
| Nippon Piston Ring Co., Ltd. | 133 |
38 |
| TPR Co., Ltd. | 151 |
27 |
| MAHLE International GmbH | 2690 |
8 |
| Federal-Mogul Burscheid GmbH | 282 |
7 |
| Hitachi Metals, Ltd. | 2026 |
6 |
| Nissan Motor Co., Ltd. | 12332 |
5 |
| MAHLE Metal Leve S/A | 158 |
5 |
| Mainspring Energy, Inc. | 105 |
5 |
| Bando Kiko Co., Ltd. | 76 |
4 |
| Isuzu Motors Limited | 2238 |
3 |
| Tokusen Kogyo Co., Ltd. | 76 |
3 |
| WB Development Company, LLC | 18 |
3 |
| ASIMCO Shuanghuan Piston Ring (Yizheng) Co., Ltd. | 5 |
2 |
| Burckhardt Compression AG | 116 |
2 |
| Honda Foundry Co., Ltd. | 24 |
2 |
| Materion Corporation | 302 |
2 |
| PSA Automobiles SA | 2069 |
2 |
| Man Energy Solutions SE | 271 |
2 |
| Honda Motor Co., Ltd. | 24865 |
1 |
| Other owners | 50 |