- All sections
- F - Mechanical engineering; lighting; heating; weapons; blasting
- F15B - Systems acting by means of fluids in general; fluid-pressure actuators, e.g. servomotors; details of fluid-pressure systems, not otherwise provided for
- F15B 21/04 - Special measures taken in connection with the properties of the fluid
Patent holdings for IPC class F15B 21/04
Total number of patents in this class: 475
10-year publication summary
|
62
|
52
|
43
|
42
|
18
|
8
|
4
|
8
|
4
|
3
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Komatsu Ltd. | 4265 |
23 |
| Hitachi Construction Machinery Co., Ltd. | 2498 |
15 |
| Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | 1407 |
15 |
| Caterpillar Inc. | 8877 |
11 |
| Yamashin-filter Corp. | 115 |
11 |
| Robert Bosch GmbH | 40953 |
10 |
| HYDAC Filtertechnik GmbH | 294 |
10 |
| Kubota Corporation | 3054 |
10 |
| Deere & Company | 6845 |
9 |
| Schaeffler Technologies AG & Co. KG | 8880 |
9 |
| Knorr-Bremse Systeme fur Schienenfahrzeuge GmbH | 566 |
9 |
| Eaton Corporation | 1839 |
8 |
| WABCO GmbH | 483 |
8 |
| The Boeing Company | 19843 |
7 |
| Festo AG & Co. KG | 313 |
6 |
| Kayaba Industry Co., Ltd. | 376 |
6 |
| U-Tec Co., Ltd. | 9 |
6 |
| Honda Motor Co., Ltd. | 24537 |
5 |
| Parker-Hannifin Corporation | 999 |
5 |
| Parker Intangibles LLC | 1237 |
5 |
| Other owners | 287 |