Methods and compositions to recover rare earth elements from organic solutions
US-2025369073-A1 · Dec 4, 2025 · US
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Oxalic acids
Oxalic acids · 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 | C22B3/322 |
| Official title | {Oxalic acids} |
| Display label | Oxalic acids |
| Total patents | 9 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2019 | 1 |
| 2021 | 1 |
| 2022 | 2 |
| 2024 | 2 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for recovering solid state electrolyte from all-solid-state-battery
US-2025233222-A1 · Jul 17, 2025 · US
Method for recycling hydrophobic deep eutectic solvent and nickel leaching method
US-2024076548-A1 · Mar 7, 2024 · US
Recycling method and use of lithium iron phosphate (lfp) waste
US-2024021904-A1 · Jan 18, 2024 · US
Carbamides for separating uranium(VI) and plutonium(IV) without reducing the plutonium(IV)
US-11479833-B2 · Oct 25, 2022 · US
Extractant for rare earth extraction from aqueous phosphoric acid solutions and method of extraction
US-11466341-B2 · Oct 11, 2022 · US
Carbamides for separating uranium(vi) and plutonium(iv) without reducing the plutonium(iv)
US-2021363609-A1 · Nov 25, 2021 · US
New extractant, useful for extracting rare earths from an aqueous phosphoric acid solution, and the applications thereof
US-2019218643-A1 · Jul 18, 2019 · US
Method for preparation of high purity, crystalline cobalt nitrate from spent cobalt/silica catalyst
US-8986644-B2 · Mar 24, 2015 · US