- All sections
- C - Chemistrymetallurgy
- C21D - Modifying the physical structure of ferrous metalsgeneral devices for heat treatment of ferrous or non-ferrous metals or alloysmaking metal malleable, e.g. by decarburisation or tempering
- C21D 9/56 - Continuous furnaces for strip or wire
Patent holdings for IPC class C21D 9/56
Total number of patents in this class: 578
10-year publication summary
|
35
|
43
|
56
|
43
|
32
|
32
|
37
|
43
|
32
|
17
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7508 |
145 |
| ArcelorMittal | 2663 |
46 |
| Nippon Steel Corporation | 6843 |
30 |
| SMS Group GmbH | 1194 |
23 |
| Baoshan Iron & Steel Co., Ltd. | 1101 |
19 |
| Fives Stein | 108 |
19 |
| Chugai Ro Co., Ltd. | 130 |
15 |
| Andritz Technology and Asset Management GmbH | 78 |
14 |
| POSCO Co., Ltd. | 2006 |
12 |
| ThyssenKrupp Steel Europe AG | 989 |
11 |
| Cockerill Maintenance & Ingenierie SA | 79 |
8 |
| POSCO | 2147 |
8 |
| Primetals Technologies Japan, Ltd. | 180 |
8 |
| ThyssenKrupp AG | 3423 |
7 |
| Vacuumschmelze GmbH & Co. KG | 256 |
6 |
| John Cockerill S.A. | 104 |
6 |
| Hitachi Metals, Ltd. | 1900 |
5 |
| Siemens VAI Metals Technologies SAS | 60 |
5 |
| Nippon Steel & Sumitomo Metal Corporation | 1981 |
5 |
| Tocalo Co., Ltd. | 106 |
5 |
| Other owners | 181 |