Carbon dioxide fixation method and carbon dioxide fixation system
US-12364948-B2 · Jul 22, 2025 · US
pH
pH · 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 | C25B15/031 |
| Official title | pH |
| Display label | pH |
| Total patents | 66 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2017 | 3 |
| 2018 | 2 |
| 2019 | 3 |
| 2020 | 3 |
| 2021 | 8 |
| 2022 | 3 |
| 2023 | 16 |
| 2024 | 17 |
| 2025 | 6 |
| 2026 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Electrolyzers
US-2025171912-A1 · May 29, 2025 · US
Method for operating an electrolysis plant, and electrolysis plant
US-2025163586-A1 · May 22, 2025 · US
Co2 electroreduction to multi-carbon products in strong acid
US-2025019844-A1 · Jan 16, 2025 · US
System, apparatus, and method to create synthetic fuel
US-2024401211-A1 · Dec 5, 2024 · US
CO2 electroreduction to multi-carbon products in strong acid
US-12134826-B2 · Nov 5, 2024 · US
Neutralization in electro-chemical activation systems
US-12071698-B2 · Aug 27, 2024 · US
Electrolytic device
US-2024271296-A1 · Aug 15, 2024 · US
System for electrocatalytic conversion of carbon oxides to multicarbon products using a stationary catholyte layer and related process
US-2024271294-A1 · Aug 15, 2024 · US
Operation support apparatus, operation support method, and computer readable medium
US-2024263331-A1 · Aug 8, 2024 · US
Water electrolysis apparatus, water electrolysis method, and method of recycling nickel-hydrogen rechargeable battery
US-2024247381-A1 · Jul 25, 2024 · US
High fluid velocity cell design for the electrochemical generation of hydrogen and carbon dioxide
US-2024240338-A1 · Jul 18, 2024 · US
Hydrogen generation and carbon dioxide storage system capable of selectively dissolving and storing carbon dioxide
US-2024191364-A1 · Jun 13, 2024 · US
Tandem electrolysis cell
US-12000056-B2 · Jun 4, 2024 · US
Systems and Methods for Electrochemical Hydrogen Looping
US-2024133051-A1 · Apr 25, 2024 · US
Co2 electroreduction to multi-carbon products in strong acid
US-2024093390-A1 · Mar 21, 2024 · US
Method and electrolysis device for the production of chlorine, carbon monoxide and optionally hydrogen
US-2024084462-A1 · Mar 14, 2024 · US
Plasma assisted electrocatalytic conversion
US-2024052502-A1 · Feb 15, 2024 · US
Pulsed power supply for sustainable redox agent supply for hydrogen abatement during electrochemical hypochlorite generation
US-2024043294-A1 · Feb 8, 2024 · US
Electrolyzers
US-2024035172-A1 · Feb 1, 2024 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C25B15/031?
- CPC C25B15/031 is the Cooperative Patent Classification code for “pH.”
- How many patents are filed under CPC C25B15/031 (pH)?
- Our database includes 66 publications tagged with this CPC code.
- Is patent activity under CPC C25B15/031 growing?
- Publication counts under this code: 17 in 2024 vs 6 in 2025 (latest complete years).