Two-phase sulfate reduction device and treatment method for preventing sludge calcification
US-2025353766-A1 · Nov 20, 2025 · US
Chemistry & Metallurgy
Chemistry & Metallurgy · 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 | C02F3/286 |
| Official title | — |
| Display label | Chemistry & Metallurgy (mapped technology topic) |
| Total patents | 60 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 6 |
| 2017 | 9 |
| 2018 | 5 |
| 2019 | 1 |
| 2020 | 8 |
| 2021 | 5 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 5 |
| 2025 | 7 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
High-load organic wastewater dark fermentation biohydrogen production device and hydrogen production method
US-12404192-B2 · Sep 2, 2025 · US
System and method for treatment of animal manure containing wastewater
US-12384707-B2 · Aug 12, 2025 · US
Bioretention pond for rainwater treatment
US-12378145-B2 · Aug 5, 2025 · US
High-load organic wastewater dark fermentation biohydrogen production device and hydrogen production method
US-2025136485-A1 · May 1, 2025 · US
System and method of high efficacy two-stage metal treatment incorporating basic oxygen furnace slag and microbial sulfate reduction
US-2025074803-A1 · Mar 6, 2025 · US
Membrane bioreactor system for treating wastewater using oxygen
US-2025002386-A1 · Jan 2, 2025 · US
Stormwater runoff treatment substrate comprising pyrite substrate layer and biochar substrate layer
US-12139422-B2 · Nov 12, 2024 · US
Stormwater runoff treatment substrate and stormwater bioretention system constructed by using substrate
US-2024109792-A1 · Apr 4, 2024 · US
Method of reducing nitrogen oxide concentration in sample, bioreactor, and plug flow reactor
US-2024102054-A1 · Mar 28, 2024 · US
Modular system for waste treatment, water recycling, and resource recovery in a space environment
US-11891321-B2 · Feb 6, 2024 · US
Stormwater runoff treatment substrate and stormwater bioretention system constructed by using substrate
US-11878920-B2 · Jan 23, 2024 · US
Bioretention pond for rainwater treatment
US-2023416129-A1 · Dec 28, 2023 · US
Hyper-rate anaerobic digestion system for enhanced bio-solids reduction
US-11691904-B2 · Jul 4, 2023 · US
Method for pre-conditioning sludge
US-11453608-B2 · Sep 27, 2022 · US
Simultaneous phase operated anaerobic sequential batch reactor
US-11267736-B2 · Mar 8, 2022 · US
Stormwater runoff treatment substrate and stormwater bioretention system constructed by using substrate
US-2022064024-A1 · Mar 3, 2022 · US
Modular system for waste treatment, water recycling, and resource recovery in a space environment
US-2021395125-A1 · Dec 23, 2021 · US
Partial nitrification-denitrification coupled two-stage autotrophic denitrification advanced nitrogen removal method
US-11203541-B2 · Dec 21, 2021 · US
Two stage anaerobic digestion with intermediate hydrolysis
US-11021381-B2 · Jun 1, 2021 · US
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C02F3/286?
- CPC C02F3/286 is the Cooperative Patent Classification code for “Chemistry & Metallurgy.”
- How many patents are filed under CPC C02F3/286 (Chemistry & Metallurgy)?
- Our database includes 60 publications tagged with this CPC code.
- Is patent activity under CPC C02F3/286 growing?
- Publication counts under this code: 5 in 2024 vs 7 in 2025 (latest complete years).