C02F 3/32
Biological treatment of water, waste water, or sewage: characterised by the animals
Official title: characterised by the animals or plants used, e.g. algae
C02F3/32 (Biological treatment of water, waste water, or sewage: characterised by the animals) appears on 692 US grants and 800 published applications in this corpus.
Search patents in C02F- Granted patents
- 692
- Published applications
- 800
- Assignees
- 532
- Inventors
- 1,858
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 7 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 7 | 0 |
| 1992 | 11 | 0 |
| 1993 | 6 | 0 |
| 1994 | 5 | 0 |
| 1995 | 13 | 0 |
| 1996 | 17 | 0 |
| 1997 | 9 | 0 |
| 1998 | 15 | 0 |
| 1999 | 11 | 0 |
| 2000 | 7 | 0 |
| 2001 | 17 | 2 |
| 2002 | 10 | 12 |
| 2003 | 10 | 17 |
| 2004 | 13 | 12 |
| 2005 | 13 | 24 |
| 2006 | 16 | 17 |
| 2007 | 13 | 9 |
| 2008 | 14 | 19 |
| 2009 | 18 | 31 |
| 2010 | 19 | 25 |
| 2011 | 15 | 33 |
| 2012 | 22 | 39 |
| 2013 | 11 | 36 |
| 2014 | 28 | 44 |
| 2015 | 22 | 38 |
| 2016 | 20 | 39 |
| 2017 | 27 | 36 |
| 2018 | 26 | 38 |
| 2019 | 26 | 42 |
| 2020 | 30 | 45 |
| 2021 | 36 | 61 |
| 2022 | 35 | 33 |
| 2023 | 28 | 43 |
| 2024 | 31 | 44 |
| 2025 | 22 | 30 |
| 2026 | 24 | 31 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Silica-based nanoparticles for PFAS remediation6 Oct 2026US 12,752,323 B2Regents of the University of Minnesota
- Systems and methods for stormwater management6 Oct 2026US 12,753,093 B2Advanced Drainage Systems, Inc.
- Biochar for stable solidification of heavy metals8 Sep 2026US 12,729,162 B2Chinese Research Academy of Environmental Sciences
- Porous biochar for improving severe pollution and preparation method therefor4 Aug 2026US 12,698,225 B2Chinese Research Academy of Environmental Sciences
- Vacuum air lift systems including a fluidic oscillator28 Jul 2026US 12,692,177 B2Searen, LLC
- 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.
- Chaetomorpha reactor, waterfall algae scrubber, and bubble upflow algae scrubber methods and devices - hybrid chaeto reactor algal turf scrubber20 Aug 2026US 2026/0240097 A1
- Vermifilter systems and methods for wastewater filtration20 Aug 2026US 2026/0242262 A1TBF-Solutions Inc.
- Onsite sustainable sanitation devices for water and nutrient recycling and methods of use thereof20 Aug 2026US 2026/0242264 A1
- Plant-based metal recovery platform20 Aug 2026US 2026/0242889 A1PIMIRS Technologies, LLC
Most cited
By later US patents
- Controlled natural purification system for advanced wastewater treatment and protein conversion and recovery229US 4,267,038 A1981
- Method for removing soluble metals from an aqueous phase196US 5,876,484 APhytotech Limited · 1999
- Method and apparatus for treating stormwater runoff122US 6,277,274 B12001
- Microalgae separator apparatus and method117US 6,524,486 B2Sepal Technologies Ltd. · 2003
- Buoyant contact surfaces in waste treatment pond109US 4,169,050 ASolar Aquasystems, Inc. · 1979