Process for the recovery of high purity metallic sodium and the safe treatment of high calcium content sodium slag
US-12590353-B2 · Mar 31, 2026 · US
of alkali or alkaline earth metals
of alkali or alkaline earth metals · 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 | C25C3/02 |
| Official title | of alkali or alkaline earth metals |
| Display label | of alkali or alkaline earth metals |
| Total patents | 51 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 4 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 4 |
| 2020 | 3 |
| 2021 | 7 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 8 |
| 2025 | 9 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Electrolytic process for producing cement
US-2026062827-A1 · Mar 5, 2026 · US
Direct electrochemical extraction of lithium from ores
US-2026049409-A1 · Feb 19, 2026 · US
Beryllium solution production method, beryllium production method, beryllium hydroxide production method, beryllium oxide production method, solution production device, beryllium production system, and beryllium
US-12473205-B2 · Nov 18, 2025 · US
Method for producing beryllium solution, method for producing beryllium, method for producing beryllium hydroxide, method for producing beryllium oxide, and beryllium oxide
US-12467115-B2 · Nov 11, 2025 · US
Direct electrochemical extraction of lithium from ores
US-12460309-B2 · Nov 4, 2025 · US
Methods and systems for purifying metals or metal alloys
US-2025257492-A1 · Aug 14, 2025 · US
Electrochemical membrane reactor systems for removing lithium from a lithium-containing solution and related methods
US-2025257491-A1 · Aug 14, 2025 · US
Direct electrochemical extraction of lithium from ores
US-2025109517-A1 · Apr 3, 2025 · US
Apparatus and method for producing li metal
US-2025101622-A1 · Mar 27, 2025 · US
Selective sulfidation and desulfidation
US-12258672-B2 · Mar 25, 2025 · US
Lithium-mediated electrochemical ammonia synthesis
US-2025092534-A1 · Mar 20, 2025 · US
Process for the recovery of lithium
US-2024384371-A1 · Nov 21, 2024 · US
Process for the recovery of lithium
US-2024384370-A1 · Nov 21, 2024 · US
Membrane-based alkali metal salt precipitation
US-2024309520-A1 · Sep 19, 2024 · US
Membrane-based alkali metal production system
US-2024309532-A1 · Sep 19, 2024 · US
Method for refining beryllium by molten salt electrolysis
US-2024254644-A1 · Aug 1, 2024 · US
Automated corrosion monitoring and control system for molten salt equipment
US-12043904-B2 · Jul 23, 2024 · US
Method for preparing lithium metal by molten salt electrolysis
US-2024183050-A1 · Jun 6, 2024 · US
Ammonia production
US-2024002244-A1 · Jan 4, 2024 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C25C3/02?
- CPC C25C3/02 is the Cooperative Patent Classification code for “of alkali or alkaline earth metals.”
- How many patents are filed under CPC C25C3/02 (of alkali or alkaline earth metals)?
- Our database includes 51 publications tagged with this CPC code.
- Is patent activity under CPC C25C3/02 growing?
- Publication counts under this code: 8 in 2024 vs 9 in 2025 (latest complete years).