Bioretention pond for rainwater treatment
US-2023416129-A1 · Dec 28, 2023 · US
using trickle filters
using trickle filters · 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 | C02F3/04 |
| Official title | using trickle filters |
| Display label | using trickle filters |
| Total patents | 76 |
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 | 7 |
| 2016 | 8 |
| 2017 | 5 |
| 2018 | 5 |
| 2019 | 3 |
| 2020 | 10 |
| 2021 | 10 |
| 2022 | 6 |
| 2023 | 12 |
| 2024 | 9 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
System and method for treating effluent
US-11820687-B2 · Nov 21, 2023 · US
Method and installation for controlled microbiome shift for biomass densification in a biological treatment of a raw influent
US-2023365446-A1 · Nov 16, 2023 · US
Method for water treatment and recycling
US-11767243-B2 · Sep 26, 2023 · US
Side stream treatment for overflow
US-11753322-B2 · Sep 12, 2023 · US
Near-zero maintenance membrane-based integrated purification device for drinking water supply of villages and towns and a method for treating source water thereof
US-2023110489-A1 · Apr 13, 2023 · US
Method for water treatment and recycling
US-2022298041-A1 · Sep 22, 2022 · US
Combination of captivator and fixed film bioreactor solutions
US-11447408-B2 · Sep 20, 2022 · US
Addition of alkaline materials to biotrickling filter or bio-filter make-up water
US-11420161-B2 · Aug 23, 2022 · US
Residential water treatment and recycle system
US-11396464-B2 · Jul 26, 2022 · US
Wastewater treatment device and wastewater treatment method
US-2022162099-A1 · May 26, 2022 · US
Wastewater treatment device and wastewater treatment method
US-11279640-B2 · Mar 22, 2022 · US
System and method for treating effluent
US-2021230031-A1 · Jul 29, 2021 · US
Combination of Captivator and Fixed Film Bioreactor Solutions
US-2021230032-A1 · Jul 29, 2021 · US
Treatment using fixed film processes and ballasted settling
US-2021230033-A1 · Jul 29, 2021 · US
Residential water treatment and recycle system
US-2021139358-A1 · May 13, 2021 · US
Methods for using bacteria that degrade microcystin and biofilters utilizing same
US-11001515-B1 · May 11, 2021 · US
Addition of Alkaline Materials to Biotrickling Filter or Bio-filter Make-up Water
US-2021113961-A1 · Apr 22, 2021 · US
Multi-layer geotextile-plastic particle water treatment
US-10961139-B1 · Mar 30, 2021 · US
Side Stream Treatment for Overflow
US-2021087086-A1 · Mar 25, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C02F3/04?
- CPC C02F3/04 is the Cooperative Patent Classification code for “using trickle filters.”
- How many patents are filed under CPC C02F3/04 (using trickle filters)?
- Our database includes 76 publications tagged with this CPC code.
- Is patent activity under CPC C02F3/04 growing?
- Publication counts under this code: 9 in 2024 vs 1 in 2025 (latest complete years).