- 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: 643
10-year publication summary
|
30
|
27
|
22
|
30
|
23
|
64
|
59
|
75
|
72
|
35
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6833 |
188 |
| Carbon Technology Holdings, LLC | 211 |
44 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2875 |
29 |
| ArcelorMittal | 2280 |
28 |
| Nippon Steel Corporation | 6231 |
24 |
| Paul Wurth S.A. | 419 |
20 |
| Mitsubishi Heavy Industries, Ltd. | 8712 |
17 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 3976 |
15 |
| POSCO | 2187 |
12 |
| Nippon Steel Engineering Co., Ltd. | 205 |
9 |
| Midrex Technologies, Inc. | 109 |
8 |
| Primetals Technologies Austria GmbH | 532 |
8 |
| Cisdi Engineering Co., Ltd. | 100 |
7 |
| ThyssenKrupp Steel Europe AG | 954 |
6 |
| Wisdri Engineering & Research Incorporation Limited | 209 |
6 |
| Xinjiang Bayi Iron & Steel Co., Ltd. | 6 |
6 |
| Siemens VAI Metals Technologies GmbH | 222 |
5 |
| Nippon Steel & Sumikin Engineering Co., Ltd. | 184 |
5 |
| Nisshin Steel Co., Ltd. | 394 |
5 |
| SunCoke Technology and Development LLC | 237 |
5 |
| Other owners | 196 |