- All sections
- C - Chemistrymetallurgy
- C01B - Non-metallic elementscompounds thereof
- C01B 33/037 - Purification
Patent holdings for IPC class C01B 33/037
Total number of patents in this class: 341
10-year publication summary
|
10
|
16
|
16
|
15
|
12
|
16
|
12
|
11
|
14
|
4
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Wacker Chemie AG | 2109 |
26 |
| Sharp Kabushiki Kaisha | 18738 |
15 |
| Silicor Materials Inc. | 21 |
11 |
| Commissariat à l'énergie atomique et aux energies alternatives | 10917 |
10 |
| Shin-Etsu Chemical Co., Ltd. | 5663 |
8 |
| ULVAC, Inc. | 1379 |
8 |
| Tokuyama Corporation | 1394 |
6 |
| Evonik Degussa GmbH | 1525 |
5 |
| REC Silicon Inc | 75 |
5 |
| Silicio Ferrosolar S.L. | 5 |
5 |
| Milwaukee Silicon, LLC | 5 |
5 |
| REC Solar Norway AS | 11 |
5 |
| Sumitomo Chemical Company, Limited | 9049 |
4 |
| 6N Silicon Inc. | 4 |
4 |
| EFD Induction SA | 8 |
4 |
| Institut Polytechnique de Grenoble | 396 |
4 |
| Korea Institute of Energy Research | 855 |
4 |
| Umicore | 644 |
4 |
| Ferroglobe Innovation, S.L. | 5 |
4 |
| High-purity Silicon Corporation | 73 |
4 |
| Other owners | 200 |