- All sections
- C - Chemistry; metallurgy
- C21B - Manufacture of iron or steel
- C21B 7/18 - Bell-and-hopper arrangements
Patent holdings for IPC class C21B 7/18
Total number of patents in this class: 30
10-year publication summary
|
0
|
1
|
5
|
3
|
3
|
1
|
1
|
3
|
0
|
2
|
| 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 |
10 |
| JFE Steel Corporation | 6067 |
9 |
| Cisdi Engineering Co., Ltd. | 86 |
2 |
| Paul Wurth IHI Co., Ltd. | 9 |
2 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 3515 |
1 |
| Leco Corporation | 200 |
1 |
| Nippon Steel & Sumitomo Metal Corporation | 1990 |
1 |
| POSCO | 2222 |
1 |
| SMS Siemag Aktiengesellschaft | 529 |
1 |
| Woodings Industrial Corporation | 1 |
1 |
| Qinhuangdao Qinye Heavy Industry Co., Ltd | 1 |
1 |
| Other owners | 0 |