- 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
|
14
|
28
|
25
|
16
|
7
|
5
|
1
|
2
|
4
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sumitomo Electric Hardmetal Corp. | 1045 |
41 |
| Profilator GmbH & Co. KG | 62 |
15 |
| Sumitomo Electric Industries, Ltd. | 15693 |
12 |
| Gleason-Pfauter Maschinenfabrik GmbH | 93 |
11 |
| Liebherr-Verzahntechnik GmbH | 69 |
6 |
| Mitsubishi Materials Corporation | 2473 |
6 |
| Prawema Antriebstechnik GmbH | 35 |
4 |
| ZF Friedrichshafen AG | 7177 |
3 |
| JTEKT Corporation | 2518 |
3 |
| American Axle & Manufacturing, Inc. | 651 |
3 |
| Klingelnberg AG | 82 |
3 |
| Schaeffler Technologies AG & Co. KG | 10106 |
2 |
| Jiangsu University | 1119 |
2 |
| Mitsubishi Heavy Industries Machine Tool Co., Ltd. | 140 |
2 |
| Mitsubishi Hitachi Tool Engineering, Ltd. | 91 |
2 |
| SEW-EURODRIVE GmbH & Co. KG | 1972 |
2 |
| Gleason Switzerland AG | 11 |
2 |
| Mitsubishi Heavy Industries, Ltd. | 8847 |
1 |
| Dowa Thermotech Co., Ltd. | 48 |
1 |
| Hermes Schleifmittel GmbH | 26 |
1 |
| Other owners | 20 |