- All sections
- B - Performing operationstransporting
- B21B - Rolling of metal
- B21B 25/00 - Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group Accessories or auxiliary means therefor
Patent holdings for IPC class B21B 25/00
Total number of patents in this class: 81
10-year publication summary
|
6
|
6
|
7
|
2
|
2
|
2
|
2
|
1
|
1
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 6365 |
22 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
18 |
| Sumitomo Metal Industries, Ltd. | 366 |
7 |
| Vallourec Deutschland GmbH | 38 |
5 |
| JFE Steel Corporation | 6965 |
4 |
| SMS Meer GmbH | 64 |
4 |
| Danieli & C. Officine Meccaniche S.p.A. | 716 |
3 |
| SMS Group GmbH | 1134 |
2 |
| Taiyuan University of Science and Technology | 43 |
2 |
| Depuy Synthes Products, LLC | 2792 |
1 |
| Baoshan Iron & Steel Co., Ltd. | 968 |
1 |
| Centro Sviluppo Materiali S.p.A. | 26 |
1 |
| Coating Management Switzerland GmbH | 3 |
1 |
| DALMINE S.p.A. | 22 |
1 |
| e Ink Holdings Inc. | 643 |
1 |
| Gulfstream Aerospace Corporation | 672 |
1 |
| Hatebur Umformmaschinen AG | 39 |
1 |
| HOERBIGER Antriebstechnik Holding GmbH | 67 |
1 |
| Mazak Corporation | 44 |
1 |
| Mitsubishi Aircraft Corporation | 136 |
1 |
| Other owners | 3 |