- 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 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
Patent holdings for IPC class C21D 9/00
Total number of patents in this class: 2461
10-year publication summary
|
239
|
226
|
162
|
168
|
184
|
167
|
197
|
184
|
174
|
142
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 6514 |
266 |
| JFE Steel Corporation | 7074 |
167 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
71 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
56 |
| ArcelorMittal | 2402 |
51 |
| Hitachi Metals, Ltd. | 1957 |
32 |
| Baoshan Iron & Steel Co., Ltd. | 997 |
31 |
| Schwartz GmbH | 58 |
31 |
| POSCO Co., Ltd. | 1601 |
28 |
| Caterpillar Inc. | 9852 |
27 |
| Proterial, Ltd. | 883 |
22 |
| NTN Corporation | 4964 |
21 |
| Neturen Co., Ltd. | 198 |
19 |
| Daido Steel Co., Ltd. | 275 |
17 |
| Ebner Industrieofenbau GmbH | 142 |
17 |
| ThyssenKrupp Steel Europe AG | 962 |
17 |
| NHK Spring Co., Ltd. | 1907 |
15 |
| Robert Bosch GmbH | 43096 |
14 |
| Voestalpine Metal Forming GmbH | 78 |
14 |
| Nanjing Iron&Steel Co.,Ltd. | 171 |
14 |
| Other owners | 1531 |