- 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 1/667 - Quenching devices for spray quenching
Patent holdings for IPC class C21D 1/667
Total number of patents in this class: 326
10-year publication summary
|
25
|
37
|
36
|
39
|
32
|
24
|
19
|
11
|
17
|
12
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6935 |
21 |
| Nippon Steel Corporation | 6344 |
16 |
| Fives Stein | 105 |
14 |
| IHI Corporation | 3451 |
13 |
| ArcelorMittal | 2324 |
12 |
| SMS Group GmbH | 1131 |
12 |
| Schwartz GmbH | 58 |
11 |
| IHI Machinery and Furnace Co., Ltd. | 79 |
10 |
| Neturen Co., Ltd. | 198 |
8 |
| Voestalpine Stahl GmbH | 359 |
7 |
| Baoshan Iron & Steel Co., Ltd. | 966 |
5 |
| Cockerill Maintenance & Ingenierie SA | 80 |
5 |
| Consolidated Engineering Company, Inc. | 27 |
5 |
| Danieli & C. Officine Meccaniche S.p.A. | 716 |
5 |
| Primetals Technologies Austria GmbH | 540 |
5 |
| Thermatool Corp. | 45 |
5 |
| NTN Corporation | 4973 |
4 |
| POSCO Co., Ltd. | 1572 |
4 |
| SMS Elotherm GmbH | 15 |
4 |
| ArcelorMittal France | 93 |
3 |
| Other owners | 157 |