- 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 9/18 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for knives, scythes, scissors, or like hand cutting tools
Patent holdings for IPC class C21D 9/18
Total number of patents in this class: 42
10-year publication summary
|
8
|
1
|
1
|
4
|
3
|
3
|
4
|
3
|
4
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Hitachi Metals, Ltd. | 2026 |
7 |
| NIPPON STEEL Stainless Steel Corporation | 281 |
3 |
| EDGEWELL Personal Care Brands, LLC | 1350 |
2 |
| H.e.f. | 124 |
2 |
| Kongju National University Industry-University Cooperation Foundation | 91 |
2 |
| The Gillette Company LLC | 2545 |
2 |
| AVIC Manufacturing Technology Institute | 8 |
2 |
| Stanley Black & Decker, Inc. | 588 |
1 |
| Eveready Battery Company, Inc. | 246 |
1 |
| Camoga S.p.A. | 10 |
1 |
| Danmarks Tekniske Universitet | 934 |
1 |
| Dayton Progress Corporation | 32 |
1 |
| Hangzhou Great Star Industrial Co., Ltd. | 588 |
1 |
| Hangzhou Great Star Tools Co., Ltd. | 150 |
1 |
| Heusch GmbH & Co. KG | 10 |
1 |
| JFE Steel Corporation | 6538 |
1 |
| Kabushikikaisha AMC | 3 |
1 |
| Kondex Corporation | 83 |
1 |
| Korea Institute of Industrial Technology | 1007 |
1 |
| Osaka Municipal Technical Research Institute | 36 |
1 |
| Other owners | 9 |