C02F 11/12
Treatment of sludge: by de-watering, drying or thickening
Official title: by de-watering, drying or thickening
C02F11/12 (Treatment of sludge: by de-watering, drying or thickening) appears on 1,782 US grants and 1,956 published applications in this corpus.
Search patents in C02F- Granted patents
- 1,782
- Published applications
- 1,956
- Assignees
- 1,289
- Inventors
- 4,474
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 21 | 0 |
| 1977 | 18 | 0 |
| 1978 | 20 | 0 |
| 1979 | 18 | 0 |
| 1980 | 20 | 0 |
| 1981 | 23 | 0 |
| 1982 | 9 | 0 |
| 1983 | 13 | 0 |
| 1984 | 13 | 0 |
| 1985 | 12 | 0 |
| 1986 | 11 | 0 |
| 1987 | 13 | 0 |
| 1988 | 22 | 0 |
| 1989 | 19 | 0 |
| 1990 | 20 | 0 |
| 1991 | 16 | 0 |
| 1992 | 17 | 0 |
| 1993 | 25 | 0 |
| 1994 | 21 | 0 |
| 1995 | 23 | 0 |
| 1996 | 13 | 0 |
| 1997 | 19 | 0 |
| 1998 | 21 | 0 |
| 1999 | 26 | 0 |
| 2000 | 25 | 0 |
| 2001 | 22 | 8 |
| 2002 | 36 | 26 |
| 2003 | 21 | 33 |
| 2004 | 24 | 36 |
| 2005 | 23 | 40 |
| 2006 | 26 | 45 |
| 2007 | 27 | 37 |
| 2008 | 31 | 38 |
| 2009 | 27 | 62 |
| 2010 | 41 | 72 |
| 2011 | 30 | 46 |
| 2012 | 36 | 59 |
| 2013 | 30 | 83 |
| 2014 | 40 | 82 |
| 2015 | 42 | 103 |
| 2016 | 42 | 103 |
| 2017 | 72 | 96 |
| 2018 | 83 | 101 |
| 2019 | 73 | 115 |
| 2020 | 96 | 115 |
| 2021 | 98 | 134 |
| 2022 | 99 | 137 |
| 2023 | 85 | 120 |
| 2024 | 90 | 128 |
| 2025 | 90 | 84 |
| 2026 | 40 | 53 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Device for influent distribution and thickened sludge fermentation to enhance MSBR system6 Oct 2026US 12,753,100 B2Corstar Environmental Equipment Shanghai Ltd
- Systems, methods, and compounds for sustainable wastewater treatment and co-products thereof8 Sep 2026US 12,729,144 B2
- System and method of using nanobubbles in a dewatering process for a liquid-solid stream8 Sep 2026US 12,729,146 B2Moleaer, Inc.
- Dewatering method and system18 Aug 2026US 12,709,562 B2Weir Minerals Australia Ltd.
- Assemblies and methods for material extraction from retention collections11 Aug 2026US 12,703,585 B2Industrial Vacuum Transfer Services USA, LLC
- Assemblies and methods for material extraction from retention collections24 Sep 2026US 2026/0285620 A1Industrial Vacuum Transfer Services USA, LLC
- Method and System for Fine Particulate Removal and Processing from a Coal Combustion Residual Surface Impoundment24 Sep 2026US 2026/0285729 A1United Conveyor Corporation
- Tank cleaning system17 Sep 2026US 2026/0273595 A1
- Synergistic integrated methods for processing hydrocarbon/organic matter containing water streams17 Sep 2026US 2026/0274728 A1
- Measurement apparatus for and method of dewatered sludge10 Sep 2026US 2026/0265082 A1Senfit Oy
Most cited
By later US patents
- Continuous process for the reclamation of waste drilling fluids141US 4,482,459 ANewpark Waste Treatment Systems Inc. · 1984
- Methods to de-sulfate saline streams107US 7,789,159 B12010
- Waste conversion process and products104US 5,431,702 ADynecology Incorporated · 1995
- Method of treating wastewater sludge98US 4,781,842 AN-Viro Energy Systems Ltd. · 1988
- Methods for treatment of waste streams97US 5,846,425 A1998