- All sections
- C - Chemistry; metallurgy
- C21B - Manufacture of iron or steel
- C21B 7/20 - Bell-and-hopper arrangements with appliances for distributing the burden
Patent holdings for IPC class C21B 7/20
Total number of patents in this class: 123
10-year publication summary
|
5
|
4
|
9
|
5
|
6
|
4
|
4
|
3
|
1
|
4
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Paul Wurth S.A. | 392 |
67 |
| JFE Steel Corporation | 6067 |
14 |
| Cisdi Engineering Co., Ltd. | 86 |
5 |
| Danieli & C. Officine Meccaniche S.p.A. | 680 |
4 |
| Siemens VAI Metals Technologies, Ltd. | 20 |
3 |
| Siemens VAI Metals Technologies GmbH | 233 |
2 |
| Danieli Corus BV | 28 |
2 |
| Nippon Steel Hardfacing Co., Ltd. | 12 |
2 |
| Nippon Steel & Sumitomo Metal Corporation | 1990 |
2 |
| CISDI Research & Development Co., Ltd. | 27 |
2 |
| Tdco GmbH | 2 |
2 |
| Cimprogetti S.p.A. | 2 |
1 |
| General Kinematics Corporation | 144 |
1 |
| Nippon Steel Engineering Co., Ltd. | 218 |
1 |
| Outotec Oyj | 318 |
1 |
| Patco Engineering GmbH | 7 |
1 |
| POSCO | 2222 |
1 |
| RWE Power Aktiengesellschaft | 44 |
1 |
| Tenova S.p.A. | 150 |
1 |
| University of Science and Technology Beijing | 245 |
1 |
| Other owners | 9 |