- 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: 2422
10-year publication summary
|
239
|
226
|
162
|
168
|
184
|
167
|
197
|
181
|
174
|
105
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 6334 |
250 |
| JFE Steel Corporation | 6916 |
163 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
71 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2877 |
54 |
| ArcelorMittal | 2319 |
48 |
| Hitachi Metals, Ltd. | 1973 |
32 |
| Schwartz GmbH | 58 |
31 |
| Baoshan Iron & Steel Co., Ltd. | 966 |
30 |
| Caterpillar Inc. | 9628 |
27 |
| POSCO Co., Ltd. | 1571 |
27 |
| Proterial, Ltd. | 860 |
22 |
| NTN Corporation | 4970 |
21 |
| Neturen Co., Ltd. | 198 |
19 |
| Ebner Industrieofenbau GmbH | 141 |
17 |
| Robert Bosch GmbH | 42813 |
16 |
| Daido Steel Co., Ltd. | 271 |
16 |
| ThyssenKrupp Steel Europe AG | 959 |
16 |
| NHK Spring Co., Ltd. | 1879 |
15 |
| Voestalpine Metal Forming GmbH | 77 |
14 |
| Benteler Automobiltechnik GmbH | 289 |
13 |
| Other owners | 1520 |