C02F 3/1221
Comprising treatment of the recirculated sludge
Official title: {comprising treatment of the recirculated sludge}
C02F3/1221 (Comprising treatment of the recirculated sludge) appears on 224 US grants and 180 published applications in this corpus.
Search patents in C02F- Granted patents
- 224
- Published applications
- 180
- Assignees
- 138
- Inventors
- 445
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 8 | 0 |
| 1992 | 10 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 6 | 0 |
| 2000 | 10 | 0 |
| 2001 | 3 | 3 |
| 2002 | 9 | 4 |
| 2003 | 4 | 5 |
| 2004 | 5 | 3 |
| 2005 | 0 | 3 |
| 2006 | 4 | 8 |
| 2007 | 2 | 6 |
| 2008 | 8 | 10 |
| 2009 | 11 | 11 |
| 2010 | 4 | 5 |
| 2011 | 5 | 6 |
| 2012 | 3 | 4 |
| 2013 | 5 | 14 |
| 2014 | 9 | 12 |
| 2015 | 4 | 10 |
| 2016 | 6 | 6 |
| 2017 | 8 | 8 |
| 2018 | 5 | 5 |
| 2019 | 6 | 6 |
| 2020 | 9 | 13 |
| 2021 | 9 | 11 |
| 2022 | 7 | 5 |
| 2023 | 3 | 1 |
| 2024 | 6 | 5 |
| 2025 | 2 | 9 |
| 2026 | 4 | 7 |
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
- Device for influent distribution and thickened sludge fermentation to enhance MSBR system6 Oct 2026US 12,753,100 B2Corstar Environmental Equipment Shanghai Ltd
- Separation of fluids containing solids28 Apr 2026US 12,611,678 B2World Water Works, Inc.
- Method for wastewater treatment control through microorganism metabolic pathway optimization6 Jan 2026US 12,515,969 B2
- Pump-based system for wastewater treatment through microorganism biochemical pathway optimization9 Sep 2025US 12,410,081 B2
- Bioreactor with membrane filtration and methods for treating wastewater10 Sep 2026US 2026/0265098 A1Bl Technologies, Inc.
- Separation of fluids containing solids13 Aug 2026US 2026/0233236 A1World Water Works, Inc.
- Fermentation method for recovering carboxylic acids while reducing greenhouse gas emissions30 Jul 2026US 2026/0217580 A1Shanghai Municipal Engineering Design Institute (Group) Co., Ltd.
- System for valve-based wastewater treatment control through microorganism metabolic pathway optimization7 May 2026US 2026/0125300 A1
- Method for culturing cold-resistant nitrifying bacteria, method for treating nitrogen-containing water, and device for treating nitrogen-containing water5 Mar 2026US 2026/0062666 A1Kubota Corporation
Most cited
By later US patents
- Waste treatment system having integral intrachannel clarifier111US 4,446,018 AArmco Inc. · 1984
- Methods for treatment of waste streams97US 5,846,425 A1998
- Biological treatment of materials92US 5,846,424 AKhudenko Engineering, Inc. · 1998
- In-sewer treatment of wastewater and sludges81US 6,015,496 A2000
- Treatment of wastewater and sludges77US 5,616,241 A1997