C02F 2209/22
O2
C02F2209/22 (O2) appears on 565 US grants and 772 published applications in this corpus.
Search patents in C02F- Granted patents
- 565
- Published applications
- 772
- Assignees
- 499
- Inventors
- 1,718
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 9 | 0 |
| 1995 | 3 | 0 |
| 1996 | 9 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 6 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 1 |
| 2002 | 9 | 11 |
| 2003 | 11 | 14 |
| 2004 | 8 | 10 |
| 2005 | 10 | 8 |
| 2006 | 5 | 10 |
| 2007 | 7 | 17 |
| 2008 | 14 | 38 |
| 2009 | 11 | 21 |
| 2010 | 25 | 27 |
| 2011 | 12 | 28 |
| 2012 | 21 | 27 |
| 2013 | 21 | 32 |
| 2014 | 18 | 34 |
| 2015 | 19 | 41 |
| 2016 | 19 | 39 |
| 2017 | 31 | 34 |
| 2018 | 22 | 27 |
| 2019 | 29 | 22 |
| 2020 | 20 | 53 |
| 2021 | 31 | 44 |
| 2022 | 35 | 45 |
| 2023 | 31 | 63 |
| 2024 | 32 | 50 |
| 2025 | 40 | 47 |
| 2026 | 24 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for wastewater treatment control through microorganism settling optimization6 Oct 2026US 12,753,099 B1
- System and method for treating nitrate nitrogen sewage by constructed wetland15 Sep 2026US 12,735,336 B2Southern University of Science and Technology
- Method for realizing advanced nitrogen removal of domestic sewage via two stage partial nitrification-anammox coupled with sulfur autotrophic denitrification25 Aug 2026US 12,715,800 B2
- Continuous in-situ therapeutic treatment system for fish in freshwater, from seawater4 Aug 2026US 12,696,881 B2Salmoclinic Spa
- Simultaneous nitritation and denitritation system21 Jul 2026US 12,686,625 B2Nexom
- Water treatment system, pure water production method, and water treatment method1 Oct 2026US 2026/0296933 A1Organo Corporation
- Water treatment apparatus for decomposing perfluorinated compound on basis of vacuum ultraviolet rays24 Sep 2026US 2026/0285710 A1Seoul National University R&Db Foundation
- Process and system for simultaneous nitrification and denitrification17 Sep 2026US 2026/0274723 A1Fluence Water Products and Innovation Ltd
- System and method of supplements dosing to remove total nitrogen from sewage10 Sep 2026US 2026/0265106 A1
- Adaptive critic control algorithm integrating knowledge transfer for wastewater treatment process27 Aug 2026US 2026/0250168 A1Beijing University of Technology
Most cited
By later US patents
- Controlled denitrification process and system98US 5,482,630 ABoard of Regents, The University of Texas System · 1996
- Biological treatment of materials92US 5,846,424 AKhudenko Engineering, Inc. · 1998
- Method and apparatus for treating wastewater using membrane filters84US 6,863,818 B2CH2M Hill, Inc. · 2005
- Automated closed recirculating aquaculture filtration system and method83US 5,961,831 ABoard of Regents, The University of Texas System · 1999
- Automated closed recirculating aquaculture filtration system83US 6,171,480 B2Board of Regents, The University of Texas System · 2001