- 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 9/30 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for camshafts
Patent holdings for IPC class C21D 9/30
Total number of patents in this class: 145
10-year publication summary
|
8
|
21
|
9
|
14
|
14
|
9
|
10
|
4
|
4
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 5991 |
28 |
| Etxe-tar, S.A. | 62 |
10 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
10 |
| Honda Motor Co., Ltd. | 24865 |
7 |
| Aperam | 114 |
7 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2905 |
6 |
| Maschinenfabrik Alfing Kessler GmbH | 54 |
5 |
| PARKER NETSUSHORI KOGYO Co., Ltd. | 35 |
4 |
| Hyundai Motor Company | 20403 |
3 |
| UD Trucks Corporation | 129 |
3 |
| Ikergune A.I.E. | 6 |
3 |
| GM Global Technology Operations LLC | 14197 |
2 |
| Kia Motors Corporation | 7779 |
2 |
| ArcelorMittal | 2052 |
2 |
| Cummins Inc. | 2467 |
2 |
| Daido Steel Co., Ltd. | 258 |
2 |
| Denki Kogyo Co., Ltd. | 19 |
2 |
| Hegenscheidt-MFD GmbH & Co. KG | 72 |
2 |
| MAHLE International GmbH | 2690 |
2 |
| Mianyang Brilliance Ruian Automotive Components Co., Ltd. | 4 |
2 |
| Other owners | 41 |