- All sections
- B - Performing operationstransporting
- B21K - Making forged or pressed metal products, e.g. horse-shoes, rivets, bolts or wheels
- B21K 21/08 - Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
Patent holdings for IPC class B21K 21/08
Total number of patents in this class: 52
10-year publication summary
|
6
|
4
|
4
|
1
|
5
|
2
|
2
|
1
|
3
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| NGK Spark Plug Co., Ltd. | 901 |
6 |
| Pratt & Whitney Canada Corp. | 4442 |
4 |
| DL Technology, LLC | 22 |
4 |
| Caterpillar Inc. | 9166 |
3 |
| NSK Ltd. | 2738 |
3 |
| SCHOTT AG | 1673 |
3 |
| The Viking Corporation | 171 |
3 |
| Niterra Co., Ltd. | 1196 |
3 |
| Robert Bosch GmbH | 41786 |
2 |
| Wagner Spray Tech Corporation | 385 |
2 |
| Metaldyne GmbH | 2 |
2 |
| National University Corporation Tokai National Higher Education and Research System | 652 |
2 |
| Kennametal Inc. | 1386 |
1 |
| ArvinMeritor Technology, LLC | 394 |
1 |
| Corob S.p.A. Con Socio Unico | 10 |
1 |
| Daicel Corporation | 2245 |
1 |
| Deutsches Zentrum für Luft- und Raumfahrt e.V. | 760 |
1 |
| Indimet Inc. | 13 |
1 |
| Ioos LLC | 10 |
1 |
| Magna Powertrain GmbH & Co KG | 297 |
1 |
| Other owners | 7 |