- All sections
- C - Chemistrymetallurgy
- C22B - Production or refining of metalspretreatment of raw materials
- C22B 4/04 - Heavy metals
Patent holdings for IPC class C22B 4/04
Total number of patents in this class: 34
10-year publication summary
|
1
|
1
|
2
|
1
|
1
|
2
|
1
|
6
|
5
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| William Marsh Rice University | 1012 |
3 |
| ATI Properties LLC | 204 |
2 |
| Technological Resources Pty. Limited | 457 |
2 |
| China ENFI Engineering Corp. | 103 |
2 |
| Phoenix Tailings, Inc. | 29 |
2 |
| The Trustees of Columbia University in the City of New York | 3578 |
1 |
| Battelle Memorial Institute | 2494 |
1 |
| Gem Co., Ltd. | 216 |
1 |
| Iowa State University Research Foundation, Inc. | 779 |
1 |
| North Carolina State University | 1564 |
1 |
| Northeastern University | 540 |
1 |
| Oss Management Services (Pty) Limited | 3 |
1 |
| Pukyong National University Industry-University Cooperation Foundation | 345 |
1 |
| SK Innovation Co., Ltd. | 1356 |
1 |
| The South African Nuclear Energy Corporation Limited | 28 |
1 |
| ThyssenKrupp Steel Europe AG | 956 |
1 |
| Vale Inco Limited | 11 |
1 |
| Worcester Polytechnic Institute | 513 |
1 |
| Xiangguang Copper Co., Ltd. | 5 |
1 |
| FLSmidth A/S | 774 |
1 |
| Other owners | 8 |