- All sections
- F - Mechanical engineering; lighting; heating; weapons; blasting
- F01K - Steam engine plants; steam accumulators; engine plants not otherwise provided for; engines using special working fluids or cycles
- F01K 21/04 - Steam engine plants not otherwise provided for using mixtures of steam and gas; Plants generating or heating steam by bringing water or steam into direct contact with hot gas
Patent holdings for IPC class F01K 21/04
Total number of patents in this class: 135
10-year publication summary
|
16
|
12
|
18
|
12
|
6
|
10
|
6
|
12
|
2
|
4
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Siemens AG | 24990 |
4 |
| Finno Energy Oy | 15 |
4 |
| FuelCell Energy, Inc. | 337 |
3 |
| Hieta Technologies Limited | 27 |
3 |
| Gas Expansion Motors Limited | 7 |
3 |
| Mitsubishi Power, Ltd. | 1680 |
3 |
| Powerphase International, LLC | 39 |
3 |
| Alstom Technology Ltd | 1196 |
2 |
| Kawasaki Heavy Industries, Limited | 1524 |
2 |
| 8 Rivers Capital, LLC | 224 |
2 |
| Averill Partners, LLC | 6 |
2 |
| Doosan Heavy Industries & Construction Co., Ltd. | 604 |
2 |
| Energy Recovery, Inc. | 168 |
2 |
| I.v.a.r. S.p.A. | 72 |
2 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 3515 |
2 |
| Nigel A. Buchanan | 2 |
2 |
| Saab AB | 814 |
2 |
| Wojak, Bogdan | 7 |
2 |
| GE Infrastructure Technology, LLC | 5873 |
2 |
| Carnegie Corporation Ltd | 3 |
2 |
| Other owners | 86 |