C02F 11/00
Treatment of sludge
Official title: Treatment of sludge; Devices therefor
C02F11/00 (Treatment of sludge) appears on 3,333 US grants and 3,286 published applications in this corpus.
Search patents in C02F- Granted patents
- 3,333
- Published applications
- 3,286
- Assignees
- 2,177
- Inventors
- 7,798
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 52 | 0 |
| 1977 | 37 | 0 |
| 1978 | 44 | 0 |
| 1979 | 34 | 0 |
| 1980 | 53 | 0 |
| 1981 | 47 | 0 |
| 1982 | 31 | 0 |
| 1983 | 29 | 0 |
| 1984 | 23 | 0 |
| 1985 | 24 | 0 |
| 1986 | 27 | 0 |
| 1987 | 28 | 0 |
| 1988 | 42 | 0 |
| 1989 | 51 | 0 |
| 1990 | 49 | 0 |
| 1991 | 44 | 0 |
| 1992 | 44 | 0 |
| 1993 | 68 | 0 |
| 1994 | 47 | 0 |
| 1995 | 62 | 0 |
| 1996 | 50 | 0 |
| 1997 | 49 | 0 |
| 1998 | 56 | 0 |
| 1999 | 58 | 0 |
| 2000 | 64 | 0 |
| 2001 | 52 | 12 |
| 2002 | 60 | 53 |
| 2003 | 46 | 60 |
| 2004 | 48 | 72 |
| 2005 | 50 | 80 |
| 2006 | 40 | 95 |
| 2007 | 58 | 88 |
| 2008 | 61 | 91 |
| 2009 | 57 | 110 |
| 2010 | 70 | 127 |
| 2011 | 65 | 91 |
| 2012 | 74 | 124 |
| 2013 | 62 | 134 |
| 2014 | 61 | 134 |
| 2015 | 81 | 160 |
| 2016 | 75 | 171 |
| 2017 | 109 | 162 |
| 2018 | 123 | 143 |
| 2019 | 126 | 166 |
| 2020 | 138 | 173 |
| 2021 | 137 | 226 |
| 2022 | 157 | 193 |
| 2023 | 118 | 190 |
| 2024 | 138 | 193 |
| 2025 | 143 | 142 |
| 2026 | 71 | 96 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C02F 11/12Treatment of sludge: by de-watering, drying or thickening1,782
- C02F 11/02Biological treatment693
- C02F 11/06Treatment of sludge: by oxidation576
- C02F 11/18Treatment of sludge: by thermal conditioning303
- C02F 11/008Sludge treatment by fixation or solidification235
- C02F 11/10Treatment of sludge: by pyrolysis216
- C02F 11/004Sludge detoxification170
- C02F 11/006Electrochemical treatment51
All 9 subgroupsShow fewer
Recent patents
- Device for influent distribution and thickened sludge fermentation to enhance MSBR system6 Oct 2026US 12,753,100 B2Corstar Environmental Equipment Shanghai Ltd
- System and method embodiments for treating produced water using supercritical water desalination coupled with supercritical water oxidation6 Oct 2026US 12,753,101 B1Triad National Security, LLC
- Two-stage co-liquefaction mixing-reaction-filtration-heat recovery integrated apparatus6 Oct 2026US 12,753,102 B2Xi' An Jiaotong University
- Ore pelletizing compositions, devices, systems, and methods using automotive paint sludge as a binder15 Sep 2026US 12,734,565 B2Colorado School of Mines
- Systems, methods, and compounds for sustainable wastewater treatment and co-products thereof8 Sep 2026US 12,729,144 B2
- 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
- Assemblies and methods for material extraction from retention collections24 Sep 2026US 2026/0285620 A1Industrial Vacuum Transfer Services USA, LLC
- Aerobic biological wastewater treatment in a continuous flow reactor24 Sep 2026US 2026/0285722 A1HaskoningDHV Nederland B.V.
- Method and System for Fine Particulate Removal and Processing from a Coal Combustion Residual Surface Impoundment24 Sep 2026US 2026/0285729 A1United Conveyor Corporation
- Method for the treatment of complex waste24 Sep 2026US 2026/0285732 A1Suez International
Most cited
By later US patents
- Automated peritoneal dialysis system and process with in-line sterilization of dialysate252US 6,758,975 B2Piedmont Renal Clinic, PA · 2004
- Anaerobic digester system158US 6,299,774 B12001
- Process for containment of liquids as solids or semisolids152US 4,460,292 AAgritec, Inc. · 1984
- Method for processing lignocellulosic material150US 6,555,350 B2Forskningscenter Riso · 2003
- Indirectly heated thermochemical reactor apparatus and processes143US 5,059,404 AManufacturing and Technology Conversion International, Inc. · 1991