- 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: 1098
10-year publication summary
|
82
|
96
|
111
|
104
|
77
|
80
|
63
|
66
|
54
|
44
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6935 |
241 |
| Nippon Steel Corporation | 6344 |
210 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
65 |
| Sumitomo Metal Industries, Ltd. | 367 |
30 |
| Baoshan Iron & Steel Co., Ltd. | 966 |
26 |
| NHK Spring Co., Ltd. | 1880 |
24 |
| Tenaris Coiled Tubes, LLC | 22 |
14 |
| POSCO Co., Ltd. | 1572 |
13 |
| Salzgitter Flachstahl GmbH | 159 |
12 |
| Mitsubishi Heavy Industries, Ltd. | 8787 |
9 |
| Usui Co., Ltd. | 118 |
9 |
| DALMINE S.p.A. | 22 |
7 |
| Sandvik Intellectual Property AB | 1475 |
7 |
| Sumitomo Heavy Industries, Ltd. | 1949 |
7 |
| Benteler Steel/Tube GmbH | 35 |
7 |
| Tenaris Connections B.V. | 172 |
6 |
| Vallourec Deutschland GmbH | 38 |
6 |
| Hyundai Motor Company | 22315 |
5 |
| Aperam | 126 |
5 |
| Forum US, Inc. | 337 |
5 |
| Other owners | 390 |