- 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 1/32 - Soft annealing, e.g. spheroidising
Patent holdings for IPC class C21D 1/32
Total number of patents in this class: 137
10-year publication summary
|
11
|
10
|
7
|
7
|
13
|
8
|
13
|
11
|
20
|
11
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 6344 |
16 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2877 |
12 |
| JFE Steel Corporation | 6935 |
10 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
7 |
| POSCO Co., Ltd. | 1572 |
7 |
| Jiangyin Xingcheng Special Steel Works Co., Ltd. | 62 |
5 |
| Daido Steel Co., Ltd. | 271 |
4 |
| Hyundai Motor Company | 22315 |
3 |
| Aktiebolaget SKF | 2983 |
3 |
| ArcelorMittal | 2324 |
3 |
| Baoshan Iron & Steel Co., Ltd. | 966 |
3 |
| POSCO | 2181 |
3 |
| SANYO Special Steel Co., Ltd. | 226 |
3 |
| Uddeholms Aktiebolag | 195 |
3 |
| Martinrea International US Inc. | 60 |
3 |
| CRS Holdings, LLC | 155 |
3 |
| Hitachi Metals, Ltd. | 1973 |
2 |
| Komatsu Ltd. | 4576 |
2 |
| Kabushiki Kaisha Riken | 290 |
2 |
| Salzgitter Flachstahl GmbH | 159 |
2 |
| Other owners | 41 |