Pure water production device
US-2026091987-A1 · Apr 2, 2026 · US
H2
H2 · 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 | C02F2209/30 |
| Official title | H2 |
| Display label | H2 |
| Total patents | 27 |
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 |
| 2016 | 1 |
| 2017 | 1 |
| 2019 | 1 |
| 2020 | 4 |
| 2021 | 5 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 3 |
| 2025 | 4 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Ultrapure water production apparatus and ultrapure water production method
US-2026015263-A1 · Jan 15, 2026 · US
Green hydrogen from seawater
US-2025341001-A1 · Nov 6, 2025 · US
Continuous flow reactor for conversion of wastewater to biohydrogen using activated sludge and microalgae
US-12371714-B2 · Jul 29, 2025 · US
Water treatment device and water treatment method
US-2025187955-A1 · Jun 12, 2025 · US
Continuous Flow Reactor for Conversion of Wastewater to Biohydrogen Using Activated Sludge and Microalgae
US-2025109414-A1 · Apr 3, 2025 · US
A system and a method for storing biological feedstock
US-2024263083-A1 · Aug 8, 2024 · US
Pulsed power supply for sustainable redox agent supply for hydrogen abatement during electrochemical hypochlorite generation
US-2024043294-A1 · Feb 8, 2024 · US
Half-cell electrochemical configurations for self-cleaning electrochlorination devices
US-2024034648-A1 · Feb 1, 2024 · US
Pulsed power supply for sustainable redox agent supply for hydrogen abatement during electrochemical hypochlorite generation
US-11802063-B2 · Oct 31, 2023 · US
Half-cell electrochemical configurations for self-cleaning electrochlorination devices
US-11795074-B2 · Oct 24, 2023 · US
Methods of recovering platinum group metals from waste streams
US-11459253-B2 · Oct 4, 2022 · US
Implementation of feedback control for improved electrochemical system design
US-11414330-B2 · Aug 16, 2022 · US
Hydrogen water generator
US-11352273-B2 · Jun 7, 2022 · US
Implementation of feedback control for improved electrochemical system design
US-2021395911-A1 · Dec 23, 2021 · US
Water electrolysis device
US-11186914-B2 · Nov 30, 2021 · US
Methods of recovering platinum group metals from waste streams
US-2021179463-A1 · Jun 17, 2021 · US
Pulsed power supply for sustainable redox agent supply for hydrogen abatement during electrochemical hypochlorite generation
US-2021139351-A1 · May 13, 2021 · US
Half-cell electrochemical configurations for self-cleaning electrochlorination devices
US-2021130966-A1 · May 6, 2021 · US
Hydrogen water generator
US-2020361799-A1 · Nov 19, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C02F2209/30?
- CPC C02F2209/30 is the Cooperative Patent Classification code for “H2.”
- How many patents are filed under CPC C02F2209/30 (H2)?
- Our database includes 27 publications tagged with this CPC code.
- Is patent activity under CPC C02F2209/30 growing?
- Publication counts under this code: 3 in 2024 vs 4 in 2025 (latest complete years).