Metal extractant and separation recovery method of metal ions using metal extractant
US-2025243560-A1 · Jul 31, 2025 · US
This page is not indexed by search engines while we improve data quality.
Amines
Amines · 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 | C22B3/28 |
| Official title | Amines |
| Display label | Amines |
| Total patents | 22 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2017 | 2 |
| 2018 | 5 |
| 2019 | 2 |
| 2020 | 3 |
| 2021 | 2 |
| 2022 | 3 |
| 2024 | 2 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method and system for recycling metal of lithium secondary battery
US-2025215522-A1 · Jul 3, 2025 · US
Method of selective precipitation of metals using amide compounds
US-2024368727-A1 · Nov 7, 2024 · US
RECOVERY METHOD OF Ra-226, PRODUCTION METHOD OF Ra-226 SOLUTION, AND PRODUCTION METHOD OF Ac-225 SOLUTION
US-2024084419-A1 · Mar 14, 2024 · US
Methods for simultaneous leaching and extraction of precious metals
US-11427886-B2 · Aug 30, 2022 · US
Method for recovering copper, molybdenum, and precious metals from silicate-containing ore
US-2022119917-A1 · Apr 21, 2022 · US
Method for recovering copper, molybdenum, and precious metals from mineral ores via pressure oxidation
US-2022119913-A1 · Apr 21, 2022 · US
Method for separating nickel and cobalt from a solution
US-11008638-B2 · May 18, 2021 · US
Lipophilic guanidinium compounds for removal of oxyanions from aqueous solutions
US-11001554-B2 · May 11, 2021 · US
Method for separating nickel and cobalt from a solution
US-2020115773-A1 · Apr 16, 2020 · US
Method for recovering scandium
US-10570482-B2 · Feb 25, 2020 · US
System for extracting vanadium from leaching solution containing vanadium chromium silicon and for preparing vanadium pentoxide and processing method therefor
US-2020039838-A1 · Feb 6, 2020 · US
Lipophilic guanidinium compounds for removal of oxyanions from aqueous solutions
US-2019299124-A1 · Oct 3, 2019 · US
Flotation agent of thiol ether structure
US-2019151860-A1 · May 23, 2019 · US
Method for recovering scandium
US-2018371579-A1 · Dec 27, 2018 · US
Method for recovering high-purity scandium
US-10081851-B2 · Sep 25, 2018 · 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
Ion exchange resin and method for adsorbing and separating metal
US-9863018-B2 · Jan 9, 2018 · US
Method for recovering high-purity scandium
US-2017321301-A1 · Nov 9, 2017 · US