- All sections
- C - Chemistry; metallurgy
- C22B - Production or refining of metals; pretreatment of raw materials
- C22B 3/22 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means
Patent holdings for IPC class C22B 3/22
Total number of patents in this class: 589
10-year publication summary
|
38
|
43
|
55
|
32
|
33
|
62
|
48
|
65
|
106
|
41
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sumitomo Metal Mining Co., Ltd. | 1670 |
16 |
| Freeport Minerals Corporation | 80 |
9 |
| Korea Zinc Co., Ltd. | 41 |
9 |
| Mitsubishi Materials Corporation | 2378 |
9 |
| Dowa ECO-SYSTEM Co., Ltd. | 51 |
8 |
| Metso Outotec Finland Oy | 795 |
8 |
| Toray Industries, Inc. | 6652 |
7 |
| Ecopro Materials, Co., Ltd. | 17 |
7 |
| Barrick Gold Corporation | 73 |
6 |
| Guangdong Brunp Recycling Technology Co., Ltd | 674 |
6 |
| Hunan Brunp Recycling Technology Co., Ltd. | 622 |
6 |
| Outotec (Finland) Oy | 491 |
6 |
| Sherritt International Corporation | 30 |
6 |
| Li-Cycle Corp. | 36 |
6 |
| Schlumberger Technology Corporation | 9690 |
5 |
| Alliance Magnesium | 14 |
5 |
| Asaka Riken Co., Ltd. | 35 |
5 |
| Corem | 8 |
5 |
| JX Nippon Mining & Metals Corporation | 1576 |
5 |
| Eldorado Gold Corporation | 9 |
5 |
| Other owners | 450 |