C02F 3/12
Activated sludge processes
C02F3/12 (Activated sludge processes) appears on 3,619 US grants and 2,549 published applications in this corpus.
Search patents in C02F- Granted patents
- 3,619
- Published applications
- 2,549
- Assignees
- 1,724
- Inventors
- 6,318
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 93 | 0 |
| 1977 | 76 | 0 |
| 1978 | 72 | 0 |
| 1979 | 59 | 0 |
| 1980 | 80 | 0 |
| 1981 | 93 | 0 |
| 1982 | 51 | 0 |
| 1983 | 47 | 0 |
| 1984 | 68 | 0 |
| 1985 | 42 | 0 |
| 1986 | 44 | 0 |
| 1987 | 42 | 0 |
| 1988 | 60 | 0 |
| 1989 | 69 | 0 |
| 1990 | 68 | 0 |
| 1991 | 67 | 0 |
| 1992 | 71 | 0 |
| 1993 | 83 | 0 |
| 1994 | 74 | 0 |
| 1995 | 65 | 0 |
| 1996 | 85 | 0 |
| 1997 | 70 | 0 |
| 1998 | 63 | 0 |
| 1999 | 60 | 0 |
| 2000 | 68 | 0 |
| 2001 | 84 | 21 |
| 2002 | 63 | 48 |
| 2003 | 46 | 76 |
| 2004 | 65 | 69 |
| 2005 | 44 | 77 |
| 2006 | 60 | 84 |
| 2007 | 67 | 95 |
| 2008 | 66 | 120 |
| 2009 | 73 | 92 |
| 2010 | 79 | 109 |
| 2011 | 74 | 115 |
| 2012 | 79 | 106 |
| 2013 | 63 | 114 |
| 2014 | 70 | 124 |
| 2015 | 71 | 123 |
| 2016 | 62 | 108 |
| 2017 | 94 | 116 |
| 2018 | 85 | 120 |
| 2019 | 125 | 108 |
| 2020 | 109 | 133 |
| 2021 | 85 | 134 |
| 2022 | 104 | 120 |
| 2023 | 92 | 95 |
| 2024 | 68 | 100 |
| 2025 | 70 | 87 |
| 2026 | 51 | 55 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C02F 3/1236Particular type of activated sludge installations1,293
- C02F 3/20Using diffusers1,013
- C02F 3/1205Particular type of activated sludge processes861
- C02F 3/1278Provisions for mixing or aeration of the mixed liquor482
- C02F 3/22Using circulation pipes310
- C02F 3/26Using pure oxygen or oxygen-rich gas243
- C02F 3/14Using surface aeration203
- C02F 3/24Using free-fall aeration or spraying79
Recent patents
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- System and method for wastewater treatment control through microorganism settling optimization6 Oct 2026US 12,753,099 B1
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- 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.
- Biofilm reactor having at least one weighted member22 Sep 2026US 12,741,894 B2
- Two-sludge water reuse process8 Oct 2026US 2026/0308030 A1
- 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
- Systems for catalytically removing per- and polyfluoroalkyl substances from a fluid and related methods1 Oct 2026US 2026/0296939 A1Arizona Board of Regents on behalf of Arizona State University
- 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
Most cited
By later US patents
- Liquid waste oxygenation441US 5,463,176 A1995
- Frameless array of hollow fiber membranes and method of maintaining clean fiber surfaces while filtering a substrate to withdraw a permeate193US 5,248,424 AZenon Environmental Inc. · 1993
- System and method for detecting time-bomb malware168US 9,536,091 B2FireEye, Inc. · 2017
- Thermophilic aerobic waste treatment system162US 5,656,155 AIP Holding Company · 1997
- System and method for detecting time-bomb malware153US 10,083,302 B1FireEye, Inc. · 2018