- 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 1/34 - Methods of heating
Patent holdings for IPC class C21D 1/34
Total number of patents in this class: 337
10-year publication summary
|
40
|
32
|
27
|
21
|
32
|
20
|
25
|
9
|
19
|
7
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Voestalpine Stahl GmbH | 354 |
16 |
| JFE Steel Corporation | 6806 |
15 |
| Voestalpine Metal Forming GmbH | 76 |
10 |
| Etxe-tar, S.A. | 62 |
9 |
| Nippon Steel Corporation | 6195 |
9 |
| Nippon Steel & Sumikin Texeng. Co., Ltd. | 11 |
9 |
| California Institute of Technology | 3973 |
8 |
| Ebner Industrieofenbau GmbH | 142 |
8 |
| Showa Manufacturing Co., Ltd. | 9 |
8 |
| Mitsubishi Heavy Industries, Ltd. | 8664 |
7 |
| ArcelorMittal | 2254 |
7 |
| Automation, Press and Tooling, A.P.& T. Aktiebolag | 40 |
6 |
| Baoshan Iron & Steel Co., Ltd. | 960 |
6 |
| Salzgitter Flachstahl GmbH | 158 |
6 |
| Schwartz GmbH | 58 |
6 |
| ThyssenKrupp Steel Europe AG | 952 |
5 |
| Toyota Motor Corporation | 31693 |
4 |
| Aisin Takaoka Co., Ltd. | 98 |
4 |
| Benteler Automobiltechnik GmbH | 290 |
4 |
| Chugai Ro Co., Ltd. | 128 |
4 |
| Other owners | 186 |