- 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 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
Patent holdings for IPC class C21D 9/08
Total number of patents in this class: 1054
10-year publication summary
|
84
|
88
|
98
|
121
|
110
|
79
|
83
|
63
|
67
|
18
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6067 |
227 |
| Nippon Steel Corporation | 5649 |
184 |
| Nippon Steel & Sumitomo Metal Corporation | 1990 |
65 |
| Sumitomo Metal Industries, Ltd. | 453 |
40 |
| NHK Spring Co., Ltd. | 1657 |
24 |
| Baoshan Iron & Steel Co., Ltd. | 832 |
22 |
| Tenaris Coiled Tubes, LLC | 21 |
13 |
| Salzgitter Flachstahl GmbH | 155 |
12 |
| Mitsubishi Heavy Industries, Ltd. | 8217 |
11 |
| POSCO Co., Ltd. | 1059 |
10 |
| Tenaris Connections B.V. | 171 |
10 |
| Vallourec Deutschland GmbH | 52 |
10 |
| Usui Co., Ltd. | 105 |
8 |
| DALMINE S.p.A. | 22 |
7 |
| Sandvik Intellectual Property AB | 1634 |
7 |
| Benteler Steel/Tube GmbH | 37 |
7 |
| Sumitomo Heavy Industries, Ltd. | 1670 |
6 |
| Forum US, Inc. | 315 |
5 |
| Sandvik Materials Technology Deutschland GmbH | 60 |
5 |
| United States Steel Corporation | 168 |
5 |
| Other owners | 376 |