- All sections
- C - Chemistrymetallurgy
- C01B - Non-metallic elementscompounds thereof
- C01B 33/193 - Preparation of finely divided silica neither in sol nor in gel formAfter-treatment thereof by acidic treatment of silicates of aqueous solutions of silicates
Patent holdings for IPC class C01B 33/193
Total number of patents in this class: 288
10-year publication summary
|
5
|
19
|
17
|
14
|
29
|
19
|
15
|
30
|
14
|
13
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Rhodia Operations | 1587 |
90 |
| Evonik Operations GmbH | 4083 |
31 |
| Evonik Degussa GmbH | 1537 |
16 |
| AGC Si-Tech Co., Ltd. | 67 |
13 |
| Agc, Inc. | 4809 |
11 |
| PPG Industries Ohio, Inc. | 3456 |
7 |
| JGC Catalysts and Chemicals Ltd. | 253 |
7 |
| TATA Chemicals Limited | 78 |
6 |
| Tosoh Silica Corporation | 16 |
6 |
| J.M. Huber Corporation | 125 |
4 |
| Wacker Chemie AG | 2105 |
4 |
| Guangzhou Feixue Material Technology., Ltd. | 10 |
4 |
| Wuxi Hengcheng Silicon Industry Co., Ltd. | 12 |
4 |
| Merck Patent GmbH | 5873 |
3 |
| Fuji Chemical Industries Co., Ltd. | 30 |
3 |
| BASF SE | 20892 |
2 |
| Bridgestone Corporation | 7248 |
2 |
| Compagnie générale des établissements Michelin SCA | 2565 |
2 |
| Industry Academic Cooperation Foundation Keimyung University | 218 |
2 |
| M. Technique Co., Ltd. | 248 |
2 |
| Other owners | 69 |