Separation of rare earth elements
US-12584193-B2 · Mar 24, 2026 · US
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Heterocyclic compounds (C22B3/34 takes precedence)
Heterocyclic compounds (C22B3/34 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 | C22B3/36 |
| Official title | Heterocyclic compounds (C22B3/34 takes precedence) |
| Display label | Heterocyclic compounds (C22B3/34 takes precedence) |
| Total patents | 16 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2018 | 2 |
| 2019 | 1 |
| 2022 | 4 |
| 2023 | 2 |
| 2024 | 3 |
| 2025 | 1 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Metal extractant, separation recovery method of metal ions using metal extractant, and compound
US-2026015688-A1 · Jan 15, 2026 · US
Separation of rare earth elements
US-2025305091-A1 · Oct 2, 2025 · US
Cyclic amine monoamides for extracting uranium(vi) and plutonium(iv) and for separating them without reducing plutonium(iv)
US-2024410034-A1 · Dec 12, 2024 · US
Collector, flotation method, and compound
US-2024376047-A1 · Nov 14, 2024 · US
Compounds for the selective solid-liquid extraction and liquid-liquid extraction of lithium chloride
US-12077520-B2 · Sep 3, 2024 · US
Separation of rare earth elements
US-2023227942-A1 · Jul 20, 2023 · US
Separation of rare earth metals
US-2023059863-A1 · Feb 23, 2023 · US
Lithium extractant compounds and their use in selective lithium extraction from aqueous solutions
US-2022356545-A1 · Nov 10, 2022 · US
Methods for simultaneous leaching and extraction of precious metals
US-11427886-B2 · Aug 30, 2022 · US
Extracting rare earth metal from acidic solution by contacting with ionic liquid composition
US-11396684-B2 · Jul 26, 2022 · US
Ionic liquid-acid aqueous two-phase system
US-11254999-B2 · Feb 22, 2022 · US
Ionic liquid-acid aqueous two-phase system
US-2019360071-A1 · Nov 28, 2019 · US
Methods for simultaneous leaching and extraction of precious metals
US-2018142322-A1 · May 24, 2018 · US
Methods for selective leaching and extraction of precious metals in organic solvents
US-2018112289-A1 · Apr 26, 2018 · US
2,9-dipyridyl-1,10-phenanthroline derivatives useful as actinide ligands, method for synthesizing same, and uses thereof
US-9074266-B2 · Jul 7, 2015 · US