- 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 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for tubular bodies or pipes
Patent holdings for IPC class C21D 9/08
Total number of patents in this class: 1134
10-year publication summary
|
96
|
111
|
104
|
77
|
80
|
63
|
69
|
54
|
62
|
20
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7339 |
257 |
| Nippon Steel Corporation | 6687 |
226 |
| Nippon Steel & Sumitomo Metal Corporation | 1985 |
65 |
| Baoshan Iron & Steel Co., Ltd. | 1072 |
31 |
| Sumitomo Metal Industries, Ltd. | 329 |
27 |
| NHK Spring Co., Ltd. | 1935 |
24 |
| Tenaris Coiled Tubes, LLC | 23 |
14 |
| POSCO Co., Ltd. | 1656 |
13 |
| Salzgitter Flachstahl GmbH | 161 |
12 |
| Sumitomo Heavy Industries, Ltd. | 2031 |
9 |
| Usui Co., Ltd. | 122 |
9 |
| Mitsubishi Heavy Industries, Ltd. | 9016 |
8 |
| DALMINE S.p.A. | 22 |
7 |
| Tenaris Connections B.V. | 189 |
7 |
| Benteler Steel/Tube GmbH | 33 |
7 |
| Sandvik Intellectual Property AB | 1418 |
6 |
| Hyundai Motor Company | 23688 |
5 |
| Aperam | 132 |
5 |
| Forum US, Inc. | 345 |
5 |
| Sandvik Materials Technology Deutschland GmbH | 59 |
5 |
| Other owners | 392 |