- All sections
- C - Chemistry; metallurgy
- C21D - Modifying the physical structure of ferrous metals; general devices for heat treatment of ferrous or non-ferrous metals or alloys; making metal malleable, e.g. by decarburisation or tempering
- C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
Patent holdings for IPC class C21D 9/00
Total number of patents in this class: 2197
10-year publication summary
|
212
|
248
|
232
|
175
|
179
|
191
|
172
|
194
|
177
|
44
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 5649 |
205 |
| JFE Steel Corporation | 6067 |
139 |
| Nippon Steel & Sumitomo Metal Corporation | 1990 |
71 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
51 |
| Hitachi Metals, Ltd. | 2175 |
32 |
| ArcelorMittal | 1887 |
31 |
| Schwartz GmbH | 58 |
28 |
| Baoshan Iron & Steel Co., Ltd. | 832 |
24 |
| Caterpillar Inc. | 8877 |
23 |
| POSCO Co., Ltd. | 1059 |
21 |
| Robert Bosch GmbH | 40953 |
19 |
| NTN Corporation | 5008 |
19 |
| Neturen Co., Ltd. | 193 |
18 |
| Proterial, Ltd. | 638 |
17 |
| Ebner Industrieofenbau GmbH | 132 |
16 |
| ThyssenKrupp Steel Europe AG | 924 |
14 |
| NHK Spring Co., Ltd. | 1657 |
13 |
| GE Infrastructure Technology, LLC | 5873 |
13 |
| Honda Motor Co., Ltd. | 24537 |
12 |
| Komatsu Ltd. | 4265 |
12 |
| Other owners | 1419 |