Process for leaching metal sulfides with reagents having thiocarbonyl functional groups
US-10876186-B2 · Dec 29, 2020 · US
Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence)
Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence) · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C22B3/20 |
| Official title | Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence) |
| Display label | Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence) |
| Total patents | 133 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 16 |
| 2016 | 13 |
| 2017 | 9 |
| 2018 | 8 |
| 2019 | 9 |
| 2020 | 27 |
| 2021 | 13 |
| 2022 | 8 |
| 2023 | 8 |
| 2024 | 15 |
| 2025 | 5 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process for leaching metal sulfides with reagents having thiocarbonyl functional groups
US-10781502-B2 · Sep 22, 2020 · US
Method of separating mercury from an ore leachate
US-2020283871-A1 · Sep 10, 2020 · US
Lithium extraction method
US-2020071794-A1 · Mar 5, 2020 · US
System and method including multi-circuit solution extraction for recovery of metal values from metal-bearing materials
US-2020063236-A1 · Feb 27, 2020 · US
System and method including multi-circuit solution extraction for recovery of metal values from metal-bearing materials
US-10501821-B2 · Dec 10, 2019 · US
Extraction of rare earth elements and carbon rich solids from coal feedstock using ionic liquids
US-2019316225-A1 · Oct 17, 2019 · US
Silver recovery by ion exchange
US-10351930-B2 · Jul 16, 2019 · US
Method for recovering precious metal
US-2019211421-A1 · Jul 11, 2019 · US
Method for producing solutions containing nickel or cobalt
US-2019194031-A1 · Jun 27, 2019 · US
Utilization of temperature heat adsorption skin temperature as scale control reagent driver
US-10316394-B2 · Jun 11, 2019 · US
Hydrometallurgical treatment of anode sludge
US-10316389-B2 · Jun 11, 2019 · US
Methods and systems for reducing impurity metal from a refinery electrolyte solution
US-10208389-B2 · Feb 19, 2019 · US
Method for recovering metals
US-10174400-B2 · Jan 8, 2019 · US
Method and plant for processing roasted pyrites
US-10125409-B2 · Nov 13, 2018 · US
System and method including multi-circuit solution extraction for recovery of metal values from metal-bearing materials
US-2018305788-A1 · Oct 25, 2018 · US
Useful method for separating light rare earth elements and heavy rare earth elements
US-2018245181-A1 · Aug 30, 2018 · US
System and method including multi-circuit solution extraction for recovery of metal values from metal-bearing materials
US-10036080-B2 · Jul 31, 2018 · US
Method of direct solvent extraction of rare earth metals from an aqueous acid-leached ore slurry
US-10030286-B1 · Jul 24, 2018 · US
Solvent extraction settler arrangement
US-10030285-B2 · Jul 24, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C22B3/20?
- CPC C22B3/20 is the Cooperative Patent Classification code for “Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence).”
- How many patents are filed under CPC C22B3/20 (Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence))?
- Our database includes 133 publications tagged with this CPC code.
- Is patent activity under CPC C22B3/20 growing?
- Publication counts under this code: 15 in 2024 vs 5 in 2025 (latest complete years).