Process for water treatment using immersed gas transfer membranes
US-12577137-B2 · Mar 17, 2026 · US
in the gas phase
in the gas phase · 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 | C02F2209/225 |
| Official title | in the gas phase |
| Display label | in the gas phase |
| Total patents | 33 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 1 |
| 2017 | 4 |
| 2018 | 1 |
| 2019 | 4 |
| 2020 | 2 |
| 2021 | 2 |
| 2022 | 1 |
| 2023 | 5 |
| 2024 | 4 |
| 2025 | 6 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for enhancing self-enrichment of anammox bacteria by symbiotic metabolism of nitrate-dependent denitrifying bacteria
US-2025382209-A1 · Dec 18, 2025 · US
Apparatus and method for synchronously treating sewage and sludge through combination of step-feed partial nitrification and anaerobic ammonia oxidation
US-12448310-B2 · Oct 21, 2025 · US
Method for predicting aeration quantity required to maintain stable dissolved oxygen concentration in activated sludge system
US-12421144-B1 · Sep 23, 2025 · US
Process and apparatus for nitritation using membrane aerated biofilm reactor
US-2025236546-A1 · Jul 24, 2025 · US
Process and apparatus for nitritation using membrane aerated biofilm reactor
US-12297132-B2 · May 13, 2025 · US
Method for NR radio link monitoring (RLM) and evaluation period determination
US-12269761-B2 · Apr 8, 2025 · US
Data-knowledge-driven Approach for Optimal Control of Wastewater Treatment Processes
US-2024425397-A1 · Dec 26, 2024 · US
Water treatment apparatus, method for washing biological membrane in water treatment apparatus, and method for evaluating thickness of biological membrane in water treatment apparatus
US-2024351923-A1 · Oct 24, 2024 · US
Process for managing worms in membrane aerated biofilm
US-12103877-B2 · Oct 1, 2024 · US
Process for managing worms in membrane aerated biofilm
US-2024059595-A1 · Feb 22, 2024 · US
Method for nr radio link monitoring (rlm) and evaluation period determination
US-2023416132-A1 · Dec 28, 2023 · US
Wastewater treatment with suspended growth and membrane aerated biofilm
US-11673820-B2 · Jun 13, 2023 · US
Process and apparatus for nitritation using membrane aerated biofilm reactor
US-2023079372-A1 · Mar 16, 2023 · US
Apparatus and method for synchronously treating sewage and sludge through combination of step-feed partial nitrification and anaerobic ammonia oxidation
US-2023071009-A1 · Mar 9, 2023 · US
Floating apparatus for membrane biofilm reactor and process for water treatment
US-2023045679-A1 · Feb 9, 2023 · US
Process for water treatment using membrane biofilm reactor
US-11505483-B2 · Nov 22, 2022 · US
Method for NR Radio Link Monitoring (RLM) and Evaluation Period Determination
US-2021258098-A1 · Aug 19, 2021 · US
Wastewater treatment with suspended growth and membrane aerated biofilm
US-2021253460-A1 · Aug 19, 2021 · US
Membrane aerated anaerobic granular sludge reactor with efficient nitrogen removal and greenhouse gas mitigation
US-10604430-B2 · Mar 31, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C02F2209/225?
- CPC C02F2209/225 is the Cooperative Patent Classification code for “in the gas phase.”
- How many patents are filed under CPC C02F2209/225 (in the gas phase)?
- Our database includes 33 publications tagged with this CPC code.
- Is patent activity under CPC C02F2209/225 growing?
- Publication counts under this code: 4 in 2024 vs 6 in 2025 (latest complete years).