- All sections
- C - Chemistry; metallurgy
- C22B - Production or refining of metals; pretreatment of raw materials
- C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
Patent holdings for IPC class C22B 3/44
Total number of patents in this class: 1117
10-year publication summary
|
72
|
85
|
87
|
79
|
84
|
77
|
113
|
116
|
141
|
39
|
| 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 |
145 |
| JX Nippon Mining & Metals Corporation | 1576 |
38 |
| Mitsubishi Materials Corporation | 2378 |
18 |
| Freeport Minerals Corporation | 80 |
17 |
| Barrick Gold Corporation | 73 |
13 |
| Dowa Metals & Mining Co., Ltd. | 44 |
12 |
| BASF SE | 19740 |
11 |
| Commissariat à l'énergie atomique et aux energies alternatives | 10525 |
9 |
| Asaka Riken Co., Ltd. | 35 |
9 |
| Yara International ASA | 753 |
9 |
| JFE Steel Corporation | 6067 |
8 |
| Korea Zinc Co., Ltd. | 41 |
8 |
| Sherritt International Corporation | 30 |
8 |
| FLSmidth A/S | 923 |
8 |
| Excir Works Corp. | 28 |
8 |
| Bromine Compounds Ltd. | 196 |
7 |
| Guangdong Brunp Recycling Technology Co., Ltd | 674 |
7 |
| Hunan Brunp Recycling Technology Co., Ltd. | 622 |
7 |
| OCP S.A. | 70 |
7 |
| Hitachi, Ltd. | 16452 |
6 |
| Other owners | 762 |