Grey water system
US-2024051852-A1 · Feb 15, 2024 · US
DC only
DC only · 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 | C02F2201/4617 |
| Official title | DC only |
| Display label | DC only |
| Total patents | 93 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 12 |
| 2016 | 8 |
| 2017 | 3 |
| 2018 | 7 |
| 2019 | 5 |
| 2020 | 8 |
| 2021 | 10 |
| 2022 | 10 |
| 2023 | 17 |
| 2024 | 6 |
| 2025 | 4 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for electrolysis-ozone-corrosion inhibitor/electrolysis-ozone-hydrogen peroxide-corrosion inhibitor coupling treatment on toxic and refractory wastewater
US-2022356086-A1 · Nov 10, 2022 · US
Ion-Exchange Apparatus
US-2022347629-A1 · Nov 3, 2022 · US
Down-hole selective ion removal water ionizer system for subsurface applications
US-2022332607-A1 · Oct 20, 2022 · US
Capacitive deionization electrode module and water treatment apparatus and method capable of saving energy using the same
US-11377375-B2 · Jul 5, 2022 · US
Reactive electrochemical membrane system and methods of making and using
US-2022127169-A1 · Apr 28, 2022 · US
Ballast Water Management System
US-2022002172-A1 · Jan 6, 2022 · US
Ballast water management system
US-11148963-B2 · Oct 19, 2021 · US
Method and device for removing chloride ion in desulfurized wastewater by electrochemical coupling
US-2021317013-A9 · Oct 14, 2021 · US
Gas/liquid plasma reactor with pulsed power supply and secondary direct current electrodes
US-2021206667-A1 · Jul 8, 2021 · US
Gas/liquid plasma reactor with pulsed power supply and secondary direct current electrodes
US-10988390-B2 · Apr 27, 2021 · US
Electrosorption purification system with recirculation
US-10968117-B2 · Apr 6, 2021 · US
Streamlined electrochemical advanced oxidation process for potable water reuse
US-2021078876-A1 · Mar 18, 2021 · US
Liquid waste treatment system
US-10947139-B2 · Mar 16, 2021 · US
Electrochemical Membrane Module for Selectively Removing Pollutants and Preparation Method Thereof
US-2021009446-A1 · Jan 14, 2021 · US
Water treatment system
US-2021002150-A1 · Jan 7, 2021 · US
Method and device for removing chloride ion in desulfurized wastewater by electrochemical coupling
US-2021002151-A1 · Jan 7, 2021 · US
Method for removing ppcps in drinking water treatment process
US-2020262723-A1 · Aug 20, 2020 · US
Liquid treatment device
US-10723638-B2 · Jul 28, 2020 · US
Electrocoagulation using oscillating electrodes
US-10710910-B2 · Jul 14, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C02F2201/4617?
- CPC C02F2201/4617 is the Cooperative Patent Classification code for “DC only.”
- How many patents are filed under CPC C02F2201/4617 (DC only)?
- Our database includes 93 publications tagged with this CPC code.
- Is patent activity under CPC C02F2201/4617 growing?
- Publication counts under this code: 6 in 2024 vs 4 in 2025 (latest complete years).