C02F 3/1215
Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of
Official title: {Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates}
C02F3/1215 (Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of) appears on 249 US grants and 127 published applications in this corpus.
Search patents in C02F- Granted patents
- 249
- Published applications
- 127
- Assignees
- 169
- Inventors
- 510
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 8 | 0 |
| 1978 | 5 | 0 |
| 1979 | 6 | 0 |
| 1980 | 7 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 8 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 4 | 0 |
| 1988 | 14 | 0 |
| 1989 | 7 | 0 |
| 1990 | 6 | 0 |
| 1991 | 8 | 0 |
| 1992 | 9 | 0 |
| 1993 | 9 | 0 |
| 1994 | 12 | 0 |
| 1995 | 7 | 0 |
| 1996 | 9 | 0 |
| 1997 | 11 | 0 |
| 1998 | 5 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 2 |
| 2003 | 1 | 1 |
| 2004 | 1 | 3 |
| 2005 | 3 | 2 |
| 2006 | 1 | 4 |
| 2007 | 0 | 6 |
| 2008 | 1 | 4 |
| 2009 | 4 | 1 |
| 2010 | 3 | 1 |
| 2011 | 3 | 5 |
| 2012 | 1 | 6 |
| 2013 | 4 | 6 |
| 2014 | 7 | 14 |
| 2015 | 2 | 5 |
| 2016 | 4 | 5 |
| 2017 | 5 | 7 |
| 2018 | 4 | 6 |
| 2019 | 7 | 4 |
| 2020 | 7 | 9 |
| 2021 | 5 | 12 |
| 2022 | 9 | 11 |
| 2023 | 5 | 5 |
| 2024 | 3 | 4 |
| 2025 | 3 | 1 |
| 2026 | 5 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for leachate biodegradation through aquatic microorganism digestion6 Oct 2026US 12,753,098 B1
- 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.
- Inclined plate baffled A2O reactor with high oxygen transfer efficiency28 Apr 2026US 12,612,322 B2Yuxi Normal University
- Straight-line sewage treatment system for enhanced treatment of low C/N domestic sewage31 Mar 2026US 12,590,019 B2Tongji University
- Home toilet waste treatment system comprising bio-treatment device and combustion device, and method for treating toilet waste by using same31 Mar 2026US 12,590,022 B2Samsung Electronics Co., Ltd.
- System and method for addition and dissolution of minerals to provide a reduction in carbon dioxide emissions and other benefits2 Jul 2026US 2026/0184613 A1D.C. Water & Sewer Authority
- Wastewater treatment method and apparatus2 Jul 2026US 2026/0184614 A1
- Enhanced activated sludge system for removing per- and polyfluoroalkyl substances (pfas) from a flow of wastewater and/or landfill leachate23 Apr 2026US 2026/0109631 A1
- Granular activated carbon (gac) reactivation waste product enhanced activated sludge system for removing per- and polyfluoroalkyl substances (pfas) from a flow of wastewater and/or landfill leachate30 Oct 2025US 2025/0333340 A1
- Wastewater treatment using aerobic treatment with brushite precipitation and recirculation17 Oct 2024US 2024/0343621 A1Centrifuge Systems, 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
- Control of activated sludge wastewater treating process for enhanced phosphorous removal105US 4,271,026 AAir Products and Chemicals, Inc. · 1981
- Improvements in and relating to waste water treatment96US 3,964,998 ASouth African Inventions Development Corporation · 1976
- Production of non-bulking activated sludge92US 4,056,465 AAir Products and Chemicals, Inc. · 1977