- All sections
- C - Chemistry; metallurgy
- C21D - Modifying the physical structure of ferrous metals; general devices for heat treatment of ferrous or non-ferrous metals or alloys; making 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: 110
10-year publication summary
12
|
11
|
10
|
7
|
7
|
14
|
8
|
13
|
11
|
5
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Nippon Steel Corporation | 5649 |
11 |
JFE Steel Corporation | 6067 |
10 |
Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
9 |
Nippon Steel & Sumitomo Metal Corporation | 1990 |
7 |
POSCO Co., Ltd. | 1059 |
4 |
Hyundai Motor Company | 19021 |
3 |
Aktiebolaget SKF | 2700 |
3 |
ArcelorMittal | 1887 |
3 |
Jiangyin Xingcheng Special Steel Works Co., Ltd. | 58 |
3 |
Uddeholms Aktiebolag | 197 |
3 |
CRS Holdings, LLC | 156 |
3 |
Hitachi Metals, Ltd. | 2175 |
2 |
Komatsu Ltd. | 4265 |
2 |
Daido Steel Co., Ltd. | 237 |
2 |
Kabushiki Kaisha Riken | 265 |
2 |
POSCO | 2222 |
2 |
Salzgitter Flachstahl GmbH | 155 |
2 |
SANYO Special Steel Co., Ltd. | 201 |
2 |
Xi'an University of Technology | 43 |
2 |
Hebei Vocational University of Industry and Technology | 8 |
2 |
Other owners | 33 |