- 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 1/55 - Hardenability tests, e.g. end-quench tests
Patent holdings for IPC class C21D 1/55
Total number of patents in this class: 12
10-year publication summary
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Baoshan Iron & Steel Co., Ltd. | 897 |
2 |
| Integrated Heat Treating Solutions, LLC | 8 |
2 |
| The Procter & Gamble Company | 22146 |
1 |
| Robert Bosch GmbH | 41786 |
1 |
| Bridgestone Corporation | 7147 |
1 |
| Caterpillar Motoren GmbH & Co. KG | 128 |
1 |
| Consiglio Nazionale delle Ricerche | 546 |
1 |
| Nippon Steel Corporation | 6012 |
1 |
| United States Government Administrator of NASA | 27 |
1 |
| Jin Yuncheng Enterprise Co., Ltd. | 2 |
1 |
| Other owners | 0 |