- 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 1/00 - General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
Patent holdings for IPC class C21D 1/00
Total number of patents in this class: 427
10-year publication summary
|
41
|
32
|
22
|
28
|
19
|
13
|
27
|
15
|
10
|
3
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7562 |
49 |
| IHI Corporation | 3531 |
31 |
| IHI Machinery and Furnace Co., Ltd. | 76 |
25 |
| ArcelorMittal | 2688 |
17 |
| Chugai Ro Co., Ltd. | 131 |
15 |
| Baoshan Iron & Steel Co., Ltd. | 1107 |
10 |
| Nippon Steel Corporation | 6911 |
9 |
| NTN Corporation | 4918 |
7 |
| Nippon Steel & Sumikin Texeng. Co., Ltd. | 11 |
7 |
| Showa Manufacturing Co., Ltd. | 9 |
6 |
| Koyo Thermo Systems Co., Ltd. | 21 |
5 |
| Mitsubishi Chemical Corporation | 4726 |
5 |
| POSCO | 2141 |
5 |
| General Electric Company | 13908 |
4 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2837 |
4 |
| Krosakiharima Corporation | 297 |
4 |
| Magna International Inc. | 1177 |
4 |
| Nippon Steel & Sumitomo Metal Corporation | 1981 |
4 |
| POSCO Co., Ltd. | 2017 |
4 |
| Toyo Tanso Co., Ltd. | 218 |
4 |
| Other owners | 208 |