- 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: 437
10-year publication summary
|
44
|
36
|
30
|
22
|
28
|
18
|
11
|
26
|
14
|
10
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7074 |
49 |
| IHI Corporation | 3471 |
31 |
| IHI Machinery and Furnace Co., Ltd. | 79 |
25 |
| ArcelorMittal | 2402 |
17 |
| Chugai Ro Co., Ltd. | 128 |
15 |
| Nippon Steel Corporation | 6514 |
12 |
| Baoshan Iron & Steel Co., Ltd. | 997 |
9 |
| ArcelorMittal France | 88 |
8 |
| NTN Corporation | 4964 |
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 | 4612 |
5 |
| POSCO | 2173 |
5 |
| General Electric Company | 13830 |
4 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
4 |
| Krosakiharima Corporation | 290 |
4 |
| Magna International Inc. | 1232 |
4 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
4 |
| Toyo Tanso Co., Ltd. | 220 |
4 |
| Other owners | 212 |