C02F 11/002
Sludge treatment using liquids immiscible with water
Official title: {Sludge treatment using liquids immiscible with water}
C02F11/002 (Sludge treatment using liquids immiscible with water) appears on 42 US grants and 19 published applications in this corpus.
Search patents in C02F- Granted patents
- 42
- Published applications
- 19
- Assignees
- 30
- Inventors
- 99
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 0 | 1 |
| 2017 | 2 | 1 |
| 2018 | 1 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 3 |
| 2022 | 2 | 2 |
| 2023 | 1 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for regulating the addition of a flocculant to a sludge31 Mar 2026US 12,590,023 B2Andritz Inc.
- Method for treating an oily solid waste sludge18 Apr 2023US 11,629,084 B2China University of Petroleum Blue Sky(Qingdao) Petroleum Technology Co., Ltd
- Processing method for perennially polluted sludge containing oils and water, waste residues or oil sands deep in natural oil mines, and processing system thereof8 Nov 2022US 11,492,555 B2Southeast University
- High rate hydrocarbon solvent extraction system, process and method15 Mar 2022US 11,273,475 B2Clean Planet Technology Inc.
- Method and apparatus for dewatering biological solid material employing both microwave irradiation and solvent extraction26 May 2020US 10,661,320 B2Southeast University
- Solvent extraction method for petroleum sludge/oil sand assisted by particle dispersant8 May 2025US 2025/0145890 A1Shandong University
- Method for Regulating the Addition of a Flocculant to a Sludge21 Nov 2024US 2024/0383790 A1Andritz Inc.
- Processing method for perennially polluted sludge containing oils and water, waste residues or oil sands deep in natural oil mines, and processing system thereof4 Aug 2022US 2022/0243129 A1Southeast University
- Multistage separation reaction tank and method for treating sewage sludge by using alkane-based solvent using same3 Mar 2022US 2022/0064042 A1Five and Six Co., Ltd.
- Solid waste treatment method16 Dec 2021US 2021/0387885 A1China University of Petroleum Blue Sky(Qingdao) Petroleum Technology Co., Ltd
Most cited
By later US patents
- Process and apparatus for recovering clean water and solids from aqueous solids60US 4,270,974 AHanover Research Corporation · 1981
- Process and apparatus for recovering residual oil from solids dehydrated in an oil medium and grossly deoiled56US 3,950,230 AHanover Research Corporation · 1976
- Method and apparatus for treatment of oil contaminated sludge44US 4,812,225 AGulf Canada Resources Limited · 1989
- Process and apparatus for recovering clean water and solids from aqueous solids using mechanical vapor recompression evaporators41US 5,076,895 AHanover Research Corporation · 1991
- Process and apparatus for recovering clean water from aqueous wastes39US 4,007,094 AHanover Research Corporation · 1977