C02F 3/28
Anaerobic digestion processes
C02F3/28 (Anaerobic digestion processes) appears on 1,750 US grants and 1,552 published applications in this corpus.
Search patents in C02F- Granted patents
- 1,750
- Published applications
- 1,552
- Assignees
- 1,080
- Inventors
- 3,736
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 11 | 0 |
| 1978 | 15 | 0 |
| 1979 | 14 | 0 |
| 1980 | 17 | 0 |
| 1981 | 19 | 0 |
| 1982 | 24 | 0 |
| 1983 | 13 | 0 |
| 1984 | 16 | 0 |
| 1985 | 19 | 0 |
| 1986 | 27 | 0 |
| 1987 | 27 | 0 |
| 1988 | 23 | 0 |
| 1989 | 23 | 0 |
| 1990 | 25 | 0 |
| 1991 | 24 | 0 |
| 1992 | 16 | 0 |
| 1993 | 27 | 0 |
| 1994 | 30 | 0 |
| 1995 | 27 | 0 |
| 1996 | 40 | 0 |
| 1997 | 39 | 0 |
| 1998 | 31 | 0 |
| 1999 | 29 | 0 |
| 2000 | 24 | 0 |
| 2001 | 37 | 5 |
| 2002 | 40 | 34 |
| 2003 | 40 | 43 |
| 2004 | 35 | 49 |
| 2005 | 34 | 38 |
| 2006 | 27 | 41 |
| 2007 | 39 | 41 |
| 2008 | 30 | 37 |
| 2009 | 37 | 53 |
| 2010 | 30 | 67 |
| 2011 | 31 | 46 |
| 2012 | 40 | 67 |
| 2013 | 45 | 82 |
| 2014 | 49 | 89 |
| 2015 | 41 | 86 |
| 2016 | 47 | 80 |
| 2017 | 52 | 59 |
| 2018 | 55 | 77 |
| 2019 | 63 | 73 |
| 2020 | 60 | 86 |
| 2021 | 71 | 100 |
| 2022 | 71 | 60 |
| 2023 | 68 | 76 |
| 2024 | 59 | 73 |
| 2025 | 47 | 46 |
| 2026 | 26 | 44 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C02F 3/2806Anaerobic processes using solid supports for microorganisms439
- C02F 3/2866Particular arrangements for anaerobic reactors358
- C02F 3/286Including two or more steps323
- C02F 3/2846Using upflow anaerobic sludge blanket [uasb] reactors125
- C02F 3/2853Using anaerobic membrane bioreactors95
- C02F 3/282Using anaerobic sequencing batch reactors43
- C02F 3/2826Using anaerobic filters43
- C02F 3/2833Using fluidized bed reactors42
All 10 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
- Method of reducing nitrogen oxide concentration in sample, bioreactor, and plug flow reactor29 Sep 2026US 12,747,458 B2Korea Advanced Institute of Science and Technology
- Reduced-headspace digester1 Sep 2026US 12,722,994 B2Suez International
- Multiple chamber septic tank with a plurality of large and small access ports25 Aug 2026US 12,715,798 B2KleanTu LLC
- Anoxic bioreactor treatment followed by pH adjusted peroxide/iron treatment for enhanced, efficient selenium removal in wastewaters25 Aug 2026US 12,715,802 B2Evoqua Water Technologies LLC
- Fixed film bioreactor for purification of water and associated methods1 Oct 2026US 2026/0296937 A1WesTech Engineering, Inc.
- Methods for curtailing biogenic methane emissions using pyrogenic carbon17 Sep 2026US 2026/0274722 A1University of Delaware
- Closed-loop water system with integrated atmospheric water generation and greywater recycling17 Sep 2026US 2026/0274729 A1
- Fluid reservoir10 Sep 2026US 2026/0265099 A1
- Floating Equipment Support10 Sep 2026US 2026/0265100 A1
Most cited
By later US patents
- Apparatus for on-site production of nitrate ions409US 7,514,058 B1The Lata Group, Inc. · 2009
- Anaerobic digester system158US 6,299,774 B12001
- Method for processing lignocellulosic material150US 6,555,350 B2Forskningscenter Riso · 2003
- High-rate biological waste water treatment process using activated sludge recycle123US 4,867,883 AHampton Roads Sanitation District of the Commonwealth of Virginia · 1989
- Method and apparatus for treating stormwater runoff122US 6,277,274 B12001