C02F 3/04
Using trickle filters
Official title: using trickle filters
C02F3/04 (Using trickle filters) appears on 543 US grants and 394 published applications in this corpus.
Search patents in C02F- Granted patents
- 543
- Published applications
- 394
- Assignees
- 334
- Inventors
- 1,005
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 17 | 0 |
| 1978 | 7 | 0 |
| 1979 | 4 | 0 |
| 1980 | 10 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 5 | 0 |
| 1984 | 13 | 0 |
| 1985 | 0 | 0 |
| 1986 | 5 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 7 | 0 |
| 1991 | 10 | 0 |
| 1992 | 10 | 0 |
| 1993 | 11 | 0 |
| 1994 | 14 | 0 |
| 1995 | 9 | 0 |
| 1996 | 8 | 0 |
| 1997 | 16 | 0 |
| 1998 | 10 | 0 |
| 1999 | 15 | 0 |
| 2000 | 17 | 0 |
| 2001 | 16 | 4 |
| 2002 | 14 | 11 |
| 2003 | 8 | 12 |
| 2004 | 8 | 13 |
| 2005 | 11 | 14 |
| 2006 | 7 | 11 |
| 2007 | 14 | 8 |
| 2008 | 8 | 8 |
| 2009 | 4 | 18 |
| 2010 | 7 | 10 |
| 2011 | 11 | 15 |
| 2012 | 8 | 18 |
| 2013 | 5 | 15 |
| 2014 | 7 | 21 |
| 2015 | 8 | 17 |
| 2016 | 11 | 23 |
| 2017 | 19 | 15 |
| 2018 | 15 | 19 |
| 2019 | 22 | 14 |
| 2020 | 20 | 22 |
| 2021 | 25 | 34 |
| 2022 | 18 | 21 |
| 2023 | 23 | 22 |
| 2024 | 22 | 17 |
| 2025 | 11 | 7 |
| 2026 | 6 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods for stormwater management6 Oct 2026US 12,753,093 B2Advanced Drainage Systems, Inc.
- MABR-based method for treating rare earth mine tailwater12 May 2026US 12,623,940 B2Guangdong University of Technology
- Sump filter w/ c.o.d5 May 2026US 12,618,405 B2
- Biofilter block and use thereof for wastewater treatment10 Mar 2026US 12,570,558 B2Premier Tech Eau Et Environnement LtéE
- Systems and methods of removing toxic substances from water using vermifiltration24 Feb 2026US 12,559,398 B2Perca, Inc.
- Vegetation-based remediation systems, remediation straw and cartridge apparatuses for groundwater treatment, and methods for installation of vegetation-based remediation systems17 Sep 2026US 2026/0274724 A1Applied Natural Sciences, Inc.
- Vermifilter systems and methods for wastewater filtration20 Aug 2026US 2026/0242262 A1TBF-Solutions Inc.
- Systems and Methods for Stormwater Treatment6 Aug 2026US 2026/0225917 A1Geostorage Corporation
- Systems and methods of removing toxic substances from water using vermifiltration25 Jun 2026US 2026/0176181 A1Perca, Inc.
- Soil absorption module for effluent dispersal system23 Apr 2026US 2026/0109630 A1
Most cited
By later US patents
- Method and apparatus for treating hydrocarbon and halogenated hydrocarbon contaminated ground and ground water128US 4,401,569 AGroundwater Decontamination Systems, Inc. · 1983
- Method and apparatus for treating stormwater runoff122US 6,277,274 B12001
- Method and apparatus for treating storm water107US 5,322,629 AW & H Pacific Inc. · 1994
- Wastewater treatment system90US 5,364,529 ALevel Valley Dairy Company · 1994
- Wastewater treatment system including multiple stages of alternate aerobic-anerobic bioreactors in series85US 4,279,753 AArco Environmental Company · 1981