- All sections
- B - Performing operationstransporting
- B01D - Separation
- B01D 21/32 - Density control of clear liquid or sediment, e.g. optical control
Patent holdings for IPC class B01D 21/32
Total number of patents in this class: 79
10-year publication summary
|
4
|
8
|
7
|
12
|
9
|
8
|
6
|
4
|
4
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kemira Oyj | 1266 |
4 |
| Gem Co., Ltd. | 362 |
3 |
| RecondOil Sweden AB | 8 |
3 |
| Eco Metals Recovery (Holding) Limited | 6 |
3 |
| PT Qmb New Energy Materials | 257 |
3 |
| Degremont | 75 |
2 |
| Evoqua Water Technologies LLC | 928 |
2 |
| FMC Technologies, Inc. | 622 |
2 |
| Japan Alsi Co., Ltd. | 14 |
2 |
| Rio Tinto ALCAN International Limited | 219 |
2 |
| Suez International | 379 |
2 |
| Theranos, Inc. | 115 |
2 |
| University of Science and Technology Beijing | 316 |
2 |
| Avoca Engineers SpA | 3 |
2 |
| Metso Finland Oy | 698 |
2 |
| Zeco, LLC | 46 |
2 |
| PT Gem Indonesia New Energy Materials | 156 |
2 |
| Hitachi, Ltd. | 16221 |
1 |
| President and Fellows of Harvard College | 6118 |
1 |
| Terumo BCT, Inc. | 480 |
1 |
| Other owners | 36 |