- All sections
- C - Chemistrymetallurgy
- C21B - Manufacture of iron or steel
- C21B 5/00 - Making pig-iron in the blast furnace
Patent holdings for IPC class C21B 5/00
Total number of patents in this class: 712
10-year publication summary
|
27
|
20
|
30
|
22
|
56
|
52
|
68
|
72
|
81
|
26
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7247 |
206 |
| Carbon Technology Holdings, LLC | 226 |
47 |
| Nippon Steel Corporation | 6666 |
38 |
| ArcelorMittal | 2503 |
32 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2846 |
30 |
| Paul Wurth S.A. | 429 |
22 |
| Mitsubishi Heavy Industries, Ltd. | 8999 |
17 |
| SunCoke Technology and Development LLC | 251 |
16 |
| POSCO | 2154 |
12 |
| Primetals Technologies Austria GmbH | 563 |
10 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 4045 |
9 |
| Midrex Technologies, Inc. | 114 |
9 |
| Nippon Steel Engineering Co., Ltd. | 191 |
9 |
| Xinjiang Bayi Iron & Steel Co., Ltd. | 10 |
8 |
| Cisdi Engineering Co., Ltd. | 101 |
7 |
| ThyssenKrupp Steel Europe AG | 976 |
6 |
| Wisdri Engineering & Research Incorporation Limited | 219 |
6 |
| Siemens VAI Metals Technologies GmbH | 209 |
5 |
| Nippon Steel & Sumikin Engineering Co., Ltd. | 169 |
5 |
| Nisshin Steel Co., Ltd. | 390 |
5 |
| Other owners | 213 |