- All sections
- C - Chemistry; metallurgy
- 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: 559
10-year publication summary
52
|
30
|
27
|
22
|
30
|
23
|
64
|
58
|
69
|
19
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
JFE Steel Corporation | 6067 |
162 |
Carbon Technology Holdings, LLC | 185 |
37 |
Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
24 |
ArcelorMittal | 1887 |
23 |
Nippon Steel Corporation | 5649 |
21 |
Paul Wurth S.A. | 392 |
19 |
Mitsubishi Heavy Industries, Ltd. | 8217 |
17 |
L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 3515 |
12 |
POSCO | 2222 |
12 |
Nippon Steel Engineering Co., Ltd. | 218 |
9 |
Midrex Technologies, Inc. | 103 |
8 |
Primetals Technologies Austria GmbH | 479 |
6 |
Tata Steel Limited | 184 |
6 |
Wisdri Engineering & Research Incorporation Limited | 132 |
6 |
International Business Machines Corporation | 60644 |
5 |
Siemens VAI Metals Technologies GmbH | 233 |
5 |
Nippon Steel & Sumikin Engineering Co., Ltd. | 186 |
5 |
Nisshin Steel Co., Ltd. | 401 |
5 |
Technological Resources Pty. Limited | 444 |
5 |
ThyssenKrupp Steel Europe AG | 924 |
5 |
Other owners | 167 |