- All sections
- F - Mechanical engineeringlightingheatingweaponsblasting
- F01D - Non-positive-displacement machines or engines, e.g. steam turbines
- F01D 11/04 - Preventing or minimising internal leakage of working fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
Patent holdings for IPC class F01D 11/04
Total number of patents in this class: 313
10-year publication summary
|
34
|
39
|
37
|
14
|
17
|
17
|
10
|
11
|
16
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Rtx Corporation | 9242 |
36 |
| General Electric Company | 17076 |
28 |
| Safran Aircraft Engines | 6172 |
25 |
| Siemens AG | 24544 |
22 |
| Nuovo Pignone Tecnologie S.r.l. | 912 |
17 |
| GE Infrastructure Technology, LLC | 6163 |
15 |
| Stein Seal Company | 69 |
13 |
| Siemens Energy Global GmbH & Co. KG | 2872 |
10 |
| Mitsubishi Heavy Industries, Ltd. | 8573 |
9 |
| Mitsubishi Power, Ltd. | 1747 |
9 |
| Siemens Energy, Inc. | 1697 |
6 |
| Mitsubishi Heavy Industries Compressor Corporation | 625 |
6 |
| Pratt & Whitney Canada Corp. | 4477 |
5 |
| Mitsubishi Hitachi Power Systems, Ltd. | 993 |
5 |
| Rolls-Royce North American Technologies, Inc. | 1153 |
5 |
| Turboden SpA | 57 |
5 |
| Rolls-Royce PLC | 3011 |
4 |
| Doosan Heavy Industries & Construction Co., Ltd. | 581 |
4 |
| SNECMA S.A. | 1145 |
3 |
| Rolls-Royce Deutschland Ltd & Co KG | 804 |
3 |
| Other owners | 83 |