- 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: 736
10-year publication summary
|
27
|
22
|
30
|
23
|
64
|
58
|
76
|
73
|
84
|
54
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7527 |
211 |
| Carbon Technology Holdings, LLC | 233 |
48 |
| Nippon Steel Corporation | 6871 |
44 |
| ArcelorMittal | 2672 |
33 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2836 |
30 |
| Paul Wurth S.A. | 432 |
23 |
| Mitsubishi Heavy Industries, Ltd. | 9128 |
17 |
| SunCoke Technology and Development LLC | 245 |
17 |
| POSCO | 2143 |
12 |
| Primetals Technologies Austria GmbH | 573 |
10 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 4117 |
9 |
| Midrex Technologies, Inc. | 118 |
9 |
| Nippon Steel Engineering Co., Ltd. | 181 |
9 |
| Cisdi Engineering Co., Ltd. | 107 |
8 |
| Xinjiang Bayi Iron & Steel Co., Ltd. | 10 |
8 |
| POSCO Co., Ltd. | 2012 |
6 |
| ThyssenKrupp Steel Europe AG | 990 |
6 |
| Wisdri Engineering & Research Incorporation Limited | 222 |
6 |
| Siemens VAI Metals Technologies GmbH | 204 |
5 |
| Nippon Steel & Sumikin Engineering Co., Ltd. | 169 |
5 |
| Other owners | 220 |