Method for producing alkali metal alcoholates in an electrolysis cell
US-2024384426-A1 · Nov 21, 2024 · US
two or more diaphragms
two or more diaphragms · 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 | C25B9/21 |
| Official title | two or more diaphragms |
| Display label | two or more diaphragms |
| Total patents | 124 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2019 | 2 |
| 2020 | 4 |
| 2021 | 7 |
| 2022 | 12 |
| 2023 | 21 |
| 2024 | 41 |
| 2025 | 34 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process for the production of hydrogen through electrification of water gas shift reaction
US-2024351866-A1 · Oct 24, 2024 · US
Extraction of ammonia and sulfuric acid from ammonium-sulfate-rich (waste) waters
US-2024335793-A1 · Oct 10, 2024 · US
Compression device
US-2024301570-A1 · Sep 12, 2024 · US
Metal recovery method and metal recovery device
US-2024254643-A1 · Aug 1, 2024 · US
High fluid velocity cell design for the electrochemical generation of hydrogen and carbon dioxide
US-2024240338-A1 · Jul 18, 2024 · US
Electrochemical membrane apparatus including an electrochemical membrane reactor, and related methods
US-2024228339-A1 · Jul 11, 2024 · US
System and method for CO2 capture and electroregeneration and synchronous conversion
US-12031222-B2 · Jul 9, 2024 · US
Apparatus for depositing thin films using hydrogen peroxide
US-11987881-B2 · May 21, 2024 · US
Multi-compartment hybrid CO2 electrochemical reducer and hydrogen fuel cell
US-2024076783-A1 · Mar 7, 2024 · US
Porous transport layer with excellent electrical conductivity and method for preparing thereof
US-2024068111-A1 · Feb 29, 2024 · US
Bipolar polymer electrolyte membrane for water electrolysis and manufacturing method thereof
US-2024052509-A1 · Feb 15, 2024 · US
Multi-chambered electrochemical cell for carbon dioxide removal
US-2024018669-A1 · Jan 18, 2024 · US
Electrolytic cell
US-2023416925-A1 · Dec 28, 2023 · US
Carbon Dioxide Gas Phase Reduction Apparatus and Method for Manufacturing a Porous Reducing Electrode-Supported Electrolyte Membrane
US-2023416933-A1 · Dec 28, 2023 · US
Pure-H2O-fed Electrocatalytic CO2 Reduction to C2H4 Beyond 1000-hour Stability
US-2023399759-A1 · Dec 14, 2023 · US
Dual-membrane on-line generator for acid or alkali solution
US-11827990-B2 · Nov 28, 2023 · US
Hydrogen degassing using membrane
US-2023340675-A1 · Oct 26, 2023 · US
Manifold compatible electrolytic cell (eo cell) with coplanar fluidic and electrical connection scheme
US-2023340676-A1 · Oct 26, 2023 · US
Systems and methods for continuous generation of gases
US-2023313391-A1 · Oct 5, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C25B9/21?
- CPC C25B9/21 is the Cooperative Patent Classification code for “two or more diaphragms.”
- How many patents are filed under CPC C25B9/21 (two or more diaphragms)?
- Our database includes 124 publications tagged with this CPC code.
- Is patent activity under CPC C25B9/21 growing?
- Publication counts under this code: 41 in 2024 vs 34 in 2025 (latest complete years).