Group of cells for power adaptation of electrochemical reactors
US-2019221873-A1 · Jul 18, 2019 · US
with a gradient in the porosity
with a gradient in the porosity · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01M4/861 |
| Official title | {with a gradient in the porosity} |
| Display label | with a gradient in the porosity |
| Total patents | 225 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 12 |
| 2016 | 13 |
| 2017 | 11 |
| 2018 | 21 |
| 2019 | 22 |
| 2020 | 32 |
| 2021 | 21 |
| 2022 | 20 |
| 2023 | 27 |
| 2024 | 35 |
| 2025 | 10 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Solid oxide fuel cell
US-2019214667-A1 · Jul 11, 2019 · US
Membrane assemblies, electrode assemblies, membrane-electrode assemblies and electrochemical cells and liquid flow batteries therefrom
US-2019051922-A1 · Feb 14, 2019 · US
Gas diffusion electrode and fuel cell
US-2018375105-A1 · Dec 27, 2018 · US
Gas diffusion electrode and fuel cell
US-2018375106-A1 · Dec 27, 2018 · US
Fuel cell and method of manufacturing same
US-2018366744-A1 · Dec 20, 2018 · US
Flow batteries having an electrode with a density gradient and methods for production and use thereof
US-10109879-B2 · Oct 23, 2018 · US
Carbon sheet, gas diffusion electrode substrate, wound body, and fuel cell (as amended)
US-2018301712-A1 · Oct 18, 2018 · US
Porous solid oxide fuel cell anode with nanoporous surface and process for fabrication
US-2018269509-A1 · Sep 20, 2018 · US
Gas diffusion electrode and method for producing same
US-2018248197-A1 · Aug 30, 2018 · US
Gas diffusion electrode
US-2018219228-A1 · Aug 2, 2018 · US
Cell stack device, module, and module housing device
US-2018212251-A1 · Jul 26, 2018 · US
Electrochemical element, solid oxide fuel cell, and methods for producing the same
US-10020527-B2 · Jul 10, 2018 · US
Air secondary battery
US-9985327-B2 · May 29, 2018 · US
Cell unit, cell stack device, cell unit device and module
US-9963793-B2 · May 8, 2018 · US
Air secondary battery including cathode having trap portion
US-9954262-B2 · Apr 24, 2018 · US
Lithium-air battery cathodes and methods of making the same
US-9947932-B2 · Apr 17, 2018 · US
Gas-diffusion electrode substrate and method of manufacturing same
US-2018102552-A1 · Apr 12, 2018 · US
Positive electrode for metal-air battery and metal-air battery including the same
US-2018090770-A1 · Mar 29, 2018 · US
Self-wetting membrane electrode unit and fuel cell having such a unit
US-9911992-B2 · Mar 6, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01M4/861?
- CPC H01M4/861 is the Cooperative Patent Classification code for “with a gradient in the porosity.”
- How many patents are filed under CPC H01M4/861 (with a gradient in the porosity)?
- Our database includes 225 publications tagged with this CPC code.
- Is patent activity under CPC H01M4/861 growing?
- Publication counts under this code: 35 in 2024 vs 10 in 2025 (latest complete years).