C02F 3/00
Biological treatment of water, waste water, or sewage
Official title: Biological treatment of water, waste water, or sewage {(C02F1/006 takes precedence)}
C02F3/00 (Biological treatment of water, waste water, or sewage) appears on 8,271 US grants and 6,850 published applications in this corpus.
Search patents in C02F- Granted patents
- 8,271
- Published applications
- 6,850
- Assignees
- 4,132
- Inventors
- 15,789
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 132 | 0 |
| 1977 | 116 | 0 |
| 1978 | 118 | 0 |
| 1979 | 95 | 0 |
| 1980 | 133 | 0 |
| 1981 | 143 | 0 |
| 1982 | 93 | 0 |
| 1983 | 82 | 0 |
| 1984 | 114 | 0 |
| 1985 | 87 | 0 |
| 1986 | 100 | 0 |
| 1987 | 101 | 0 |
| 1988 | 101 | 0 |
| 1989 | 121 | 0 |
| 1990 | 110 | 0 |
| 1991 | 117 | 0 |
| 1992 | 126 | 0 |
| 1993 | 152 | 0 |
| 1994 | 151 | 0 |
| 1995 | 158 | 0 |
| 1996 | 195 | 0 |
| 1997 | 159 | 0 |
| 1998 | 165 | 0 |
| 1999 | 177 | 0 |
| 2000 | 193 | 0 |
| 2001 | 209 | 39 |
| 2002 | 177 | 145 |
| 2003 | 149 | 194 |
| 2004 | 156 | 207 |
| 2005 | 143 | 226 |
| 2006 | 145 | 209 |
| 2007 | 190 | 228 |
| 2008 | 163 | 272 |
| 2009 | 172 | 258 |
| 2010 | 183 | 286 |
| 2011 | 171 | 278 |
| 2012 | 190 | 277 |
| 2013 | 172 | 319 |
| 2014 | 199 | 343 |
| 2015 | 186 | 299 |
| 2016 | 183 | 315 |
| 2017 | 234 | 299 |
| 2018 | 230 | 300 |
| 2019 | 279 | 304 |
| 2020 | 248 | 344 |
| 2021 | 238 | 370 |
| 2022 | 243 | 298 |
| 2023 | 232 | 309 |
| 2024 | 214 | 307 |
| 2025 | 192 | 256 |
| 2026 | 134 | 168 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C02F 3/02Aerobic processes5,380
- C02F 3/34Biological treatment of water, waste water, or sewage: characterised by the microorganisms1,932
- C02F 3/28Anaerobic digestion processes1,750
- C02F 3/30Aerobic and anaerobic processes1,741
- C02F 3/006Regulation methods for biological treatment899
- C02F 3/32Biological treatment of water, waste water, or sewage: characterised by the animals692
- C02F 2003/001Biological treatment of water, waste water, or sewage: using granular carriers orIndexing code168
- C02F 3/005Combined electrochemical biological processes141
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.
- System and method for leachate biodegradation through aquatic microorganism digestion6 Oct 2026US 12,753,098 B1
- System and method for wastewater treatment control through microorganism settling optimization6 Oct 2026US 12,753,099 B1
- Device for influent distribution and thickened sludge fermentation to enhance MSBR system6 Oct 2026US 12,753,100 B2Corstar Environmental Equipment Shanghai Ltd
- Two-sludge water reuse process8 Oct 2026US 2026/0308030 A1
- Operation method of water treatment apparatus and water treatment apparatus8 Oct 2026US 2026/0308031 A1Kubota Corporation
- Media for use in wastewater treatment8 Oct 2026US 2026/0308032 A1Technologies Bionest Inc.
- Microbial Composite Bacteria for Sludge Reduction in Biochemical Systems, Preparation Method Thereof, and Application of Microbial Agent for Sludge Reduction in Biochemical Systems8 Oct 2026US 2026/0308033 A1
- Strain of paenibacillus glycanilyticus and application thereof in nitrogen removal treatment of nitrogen-containing aquaculture wastewater8 Oct 2026US 2026/0308511 A1Zhejiang Marine Fisheries Research Institute
Most cited
By later US patents
- Liquid waste oxygenation441US 5,463,176 A1995
- Apparatus for on-site production of nitrate ions409US 7,514,058 B1The Lata Group, Inc. · 2009
- Ferromagnetic separation process and material265US 3,985,649 A1976
- 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