- All sections
- B - Performing operations; transporting
- B21K - Making forged or pressed metal products, e.g. horse-shoes, rivets, bolts or wheels
- B21K 21/12 - Shaping end portions of hollow articles
Patent holdings for IPC class B21K 21/12
Total number of patents in this class: 76
10-year publication summary
|
10
|
7
|
5
|
7
|
4
|
5
|
7
|
5
|
7
|
1
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Aktiebolaget SKF | 2700 |
7 |
| NHK Spring Co., Ltd. | 1657 |
6 |
| NSK Ltd. | 2719 |
4 |
| American Axle & Manufacturing, Inc. | 649 |
3 |
| Nippon Steel Corporation | 5649 |
3 |
| Schuler Cartec GmbH & Co. KG | 4 |
3 |
| Tata Steel Limited | 184 |
3 |
| CDP Bharat Forge GmbH | 7 |
2 |
| DL Technology, LLC | 20 |
2 |
| Felss Systems GmbH | 15 |
2 |
| Parker-Hannifin Corporation | 999 |
2 |
| Seki Press Co Ltd. | 11 |
2 |
| Vallourec Deutschland GmbH | 52 |
2 |
| Tecniforja - Forjagem e Estampagem de Peças Técnicas, Lda | 3 |
2 |
| Metaldyne GmbH | 2 |
2 |
| AAM North America, Inc. | 10 |
2 |
| Siemens AG | 24990 |
1 |
| Robert Bosch GmbH | 40953 |
1 |
| NTN Corporation | 5008 |
1 |
| Smith International, Inc. | 761 |
1 |
| Other owners | 25 |