- 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 9/36 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rollers
Patent holdings for IPC class C21D 9/36
Total number of patents in this class: 70
10-year publication summary
|
8
|
10
|
10
|
3
|
6
|
8
|
4
|
5
|
2
|
2
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| NTN Corporation | 5008 |
22 |
| Aktiebolaget SKF | 2700 |
9 |
| Suzhou Zhongmenzi Industrial Furnace Technology Co., Ltd. | 19 |
4 |
| Magotteaux International S.A. | 119 |
3 |
| Schaeffler KG | 960 |
3 |
| Honda Motor Co., Ltd. | 24537 |
2 |
| ZF Friedrichshafen AG | 6820 |
2 |
| Schaeffler Technologies AG & Co. KG | 8880 |
2 |
| Aubert & Duval | 106 |
2 |
| Nippon Steel Corporation | 5649 |
2 |
| The Timken Company | 392 |
2 |
| United Technologies Corporation | 2328 |
1 |
| NSK Ltd. | 2719 |
1 |
| Duma-bandzink GmbH | 2 |
1 |
| Erasteel | 25 |
1 |
| Kobe Steel, Ltd. | 912 |
1 |
| SANYO Special Steel Co., Ltd. | 201 |
1 |
| Sintokogio, Ltd. | 1148 |
1 |
| ThyssenKrupp AG | 3086 |
1 |
| ThyssenKrupp Rothe Erde GmbH | 66 |
1 |
| Other owners | 8 |