- All sections
- B - Performing operations; transporting
- 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: 82
10-year publication summary
|
18
|
6
|
6
|
8
|
2
|
2
|
2
|
2
|
1
|
1
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 5649 |
22 |
| Nippon Steel & Sumitomo Metal Corporation | 1990 |
18 |
| Sumitomo Metal Industries, Ltd. | 453 |
8 |
| Vallourec Deutschland GmbH | 52 |
5 |
| JFE Steel Corporation | 6067 |
4 |
| SMS Meer GmbH | 68 |
4 |
| Danieli & C. Officine Meccaniche S.p.A. | 680 |
3 |
| SMS Group GmbH | 1029 |
2 |
| Taiyuan University of Science and Technology | 36 |
2 |
| Depuy Synthes Products, LLC | 2880 |
1 |
| Centro Sviluppo Materiali S.p.A. | 31 |
1 |
| Coating Management Switzerland GmbH | 3 |
1 |
| DALMINE S.p.A. | 22 |
1 |
| Damascus Steel Casting Company | 2 |
1 |
| e Ink Holdings Inc. | 571 |
1 |
| Gulfstream Aerospace Corporation | 658 |
1 |
| Hatebur Umformmaschinen AG | 39 |
1 |
| HOERBIGER Antriebstechnik Holding GmbH | 55 |
1 |
| Mazak Corporation | 39 |
1 |
| Mitsubishi Aircraft Corporation | 197 |
1 |
| Other owners | 3 |