- All sections
- B - Performing operationstransporting
- B23F - Making gears or toothed racks
- B23F 21/00 - Tools specially adapted for use in machines for manufacturing gear teeth
Patent holdings for IPC class B23F 21/00
Total number of patents in this class: 142
10-year publication summary
|
12
|
15
|
28
|
25
|
16
|
7
|
6
|
1
|
2
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sumitomo Electric Hardmetal Corp. | 1018 |
41 |
| Profilator GmbH & Co. KG | 63 |
15 |
| Sumitomo Electric Industries, Ltd. | 15455 |
12 |
| Gleason-Pfauter Maschinenfabrik GmbH | 92 |
11 |
| Liebherr-Verzahntechnik GmbH | 69 |
6 |
| Mitsubishi Materials Corporation | 2442 |
6 |
| Prawema Antriebstechnik GmbH | 35 |
4 |
| ZF Friedrichshafen AG | 7133 |
3 |
| JTEKT Corporation | 2491 |
3 |
| American Axle & Manufacturing, Inc. | 650 |
3 |
| Klingelnberg AG | 79 |
3 |
| Schaeffler Technologies AG & Co. KG | 9858 |
2 |
| Jiangsu University | 1096 |
2 |
| Mitsubishi Heavy Industries Machine Tool Co., Ltd. | 140 |
2 |
| Mitsubishi Hitachi Tool Engineering, Ltd. | 91 |
2 |
| ZECHA Hartmetall-Werkzeugfabrikation GmbH | 27 |
2 |
| Gleason Switzerland AG | 11 |
2 |
| Mitsubishi Heavy Industries, Ltd. | 8712 |
1 |
| Dowa Thermotech Co., Ltd. | 44 |
1 |
| Hermes Schleifmittel GmbH | 26 |
1 |
| Other owners | 20 |