- All sections
- F - Mechanical engineering; lighting; heating; weapons; blasting
- F01D - Non-positive-displacement machines or engines, e.g. steam turbines
- F01D 21/20 - Checking operation of shut-down devices
Patent holdings for IPC class F01D 21/20
Total number of patents in this class: 23
10-year publication summary
|
2
|
3
|
4
|
6
|
1
|
1
|
1
|
2
|
0
|
0
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Siemens AG | 24990 |
3 |
| General Electric Technology GmbH | 1657 |
3 |
| Safran Aircraft Engines | 5739 |
3 |
| General Electric Company | 18133 |
2 |
| SNECMA S.A. | 1160 |
1 |
| Mitsubishi Heavy Industries, Ltd. | 8217 |
1 |
| HYDAC System GmbH | 30 |
1 |
| Mitsubishi Hitachi Power Systems, Ltd. | 999 |
1 |
| Nuovo Pignone S.p.A. | 96 |
1 |
| Oliver Crispin Robotics Limited | 82 |
1 |
| Repower Systems AG | 56 |
1 |
| GE Infrastructure Technology, LLC | 5873 |
1 |
| Vestas Wind Systems A/S | 3459 |
1 |
| Snecma | 1065 |
1 |
| Mitsubishi Industries Compressor Corporation | 1 |
1 |
| Rtx Corporation | 8674 |
1 |
| Other owners | 0 |