C02F 3/1205
Particular type of activated sludge processes
Official title: {Particular type of activated sludge processes}
C02F3/1205 (Particular type of activated sludge processes) appears on 861 US grants and 491 published applications in this corpus.
Search patents in C02F- Granted patents
- 861
- Published applications
- 491
- Assignees
- 506
- Inventors
- 1,730
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 17 | 0 |
| 1977 | 11 | 0 |
| 1978 | 10 | 0 |
| 1979 | 14 | 0 |
| 1980 | 17 | 0 |
| 1981 | 11 | 0 |
| 1982 | 7 | 0 |
| 1983 | 11 | 0 |
| 1984 | 20 | 0 |
| 1985 | 11 | 0 |
| 1986 | 9 | 0 |
| 1987 | 16 | 0 |
| 1988 | 28 | 0 |
| 1989 | 22 | 0 |
| 1990 | 24 | 0 |
| 1991 | 36 | 0 |
| 1992 | 30 | 0 |
| 1993 | 26 | 0 |
| 1994 | 30 | 0 |
| 1995 | 31 | 0 |
| 1996 | 29 | 0 |
| 1997 | 23 | 0 |
| 1998 | 20 | 0 |
| 1999 | 15 | 0 |
| 2000 | 25 | 0 |
| 2001 | 11 | 3 |
| 2002 | 13 | 8 |
| 2003 | 8 | 12 |
| 2004 | 12 | 9 |
| 2005 | 7 | 7 |
| 2006 | 8 | 15 |
| 2007 | 3 | 16 |
| 2008 | 15 | 21 |
| 2009 | 20 | 16 |
| 2010 | 10 | 9 |
| 2011 | 9 | 17 |
| 2012 | 7 | 14 |
| 2013 | 7 | 22 |
| 2014 | 15 | 41 |
| 2015 | 11 | 21 |
| 2016 | 18 | 19 |
| 2017 | 15 | 22 |
| 2018 | 18 | 27 |
| 2019 | 32 | 22 |
| 2020 | 29 | 38 |
| 2021 | 20 | 36 |
| 2022 | 24 | 25 |
| 2023 | 16 | 15 |
| 2024 | 18 | 20 |
| 2025 | 9 | 19 |
| 2026 | 13 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C02F 3/1215Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of249
- C02F 3/121Multistep treatment237
- C02F 3/1221Comprising treatment of the recirculated sludge224
- C02F 3/1231Treatments of toxic sewage175
- C02F 3/1226Comprising an absorbent material suspended in the mixed liquor88
Recent patents
- System and method for leachate biodegradation through aquatic microorganism digestion6 Oct 2026US 12,753,098 B1
- Device for influent distribution and thickened sludge fermentation to enhance MSBR system6 Oct 2026US 12,753,100 B2Corstar Environmental Equipment Shanghai Ltd
- Method and system for continuous-flow aerobic granular sludge process with improved two-stage sedimentation29 Sep 2026US 12,747,174 B2Passavant Roediger Water Technologies (Hangzhou) Co., Ltd.
- Multiple chamber septic tank with a plurality of large and small access ports25 Aug 2026US 12,715,798 B2KleanTu LLC
- Process and system for simultaneous nitrification and denitrification2 Jun 2026US 12,643,803 B2Fluence Water Products and Innovation Ltd
- Aerobic biological wastewater treatment in a continuous flow reactor24 Sep 2026US 2026/0285722 A1HaskoningDHV Nederland B.V.
- Process and system for simultaneous nitrification and denitrification17 Sep 2026US 2026/0274723 A1Fluence Water Products and Innovation Ltd
- Bioreactor with membrane filtration and methods for treating wastewater10 Sep 2026US 2026/0265098 A1Bl Technologies, Inc.
- Membrane bioreactor wastewater treatment using calcium carbonate27 Aug 2026US 2026/0250169 A1Omya International AG
- Separation of fluids containing solids13 Aug 2026US 2026/0233236 A1World Water Works, Inc.
Most cited
By later US patents
- Treatment of highly colored wastewaters143US 5,302,288 AZimpro Environmental, Inc. · 1994
- High-rate biological waste water treatment process using activated sludge recycle123US 4,867,883 AHampton Roads Sanitation District of the Commonwealth of Virginia · 1989
- Waste treatment system having integral intrachannel clarifier111US 4,446,018 AArmco Inc. · 1984
- Control of activated sludge wastewater treating process for enhanced phosphorous removal105US 4,271,026 AAir Products and Chemicals, Inc. · 1981
- Multiple zone batch treatment process102US 5,192,442 AZimpro Passavant Environmental Systems, Inc. · 1993