- All sections
- C - Chemistrymetallurgy
- C01B - Non-metallic elementscompounds thereof
- C01B 33/025 - Preparation by reduction of silica or silica-containing material with carbon or a solid carbonaceous material, i.e. carbo-thermal process
Patent holdings for IPC class C01B 33/025
Total number of patents in this class: 89
10-year publication summary
|
1
|
7
|
6
|
3
|
5
|
4
|
8
|
10
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11
|
4
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Evonik Degussa GmbH | 1531 |
11 |
| Wacker Chemie AG | 2106 |
5 |
| Bridgestone Corporation | 7238 |
4 |
| Unifrax I LLC | 242 |
4 |
| ionobell Inc | 30 |
4 |
| Mitsubishi Chemical Corporation | 4507 |
3 |
| N.e.d. Silicon S.p.A. | 3 |
3 |
| Pyrogenesis Canada, Inc. | 67 |
3 |
| Plassein Technologies Ltd, LLC | 22 |
3 |
| Hpq-silicon Resources Inc. | 3 |
3 |
| II-VI Advanced Materials, LLC | 50 |
3 |
| Research Triangle Institute | 408 |
2 |
| Wayne State University | 686 |
2 |
| BTR New Material Group Co., Ltd. | 213 |
2 |
| Evonik Solar Norge AS | 3 |
2 |
| 6K Inc | 148 |
2 |
| HPQ Silicium Inc. | 5 |
2 |
| General Electric Company | 13780 |
1 |
| BASF SE | 20933 |
1 |
| Hewlett-Packard Development Company, L.P. | 25895 |
1 |
| Other owners | 28 |