C02F 3/302
Nitrification and denitrification treatment
Official title: {Nitrification and denitrification treatment (C02F3/308 takes precedence)}
C02F3/302 (Nitrification and denitrification treatment) appears on 1,012 US grants and 1,025 published applications in this corpus.
Search patents in C02F- Granted patents
- 1,012
- Published applications
- 1,025
- Assignees
- 586
- Inventors
- 2,437
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 5 | 0 |
| 1980 | 6 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 9 | 0 |
| 1985 | 9 | 0 |
| 1986 | 4 | 0 |
| 1987 | 8 | 0 |
| 1988 | 9 | 0 |
| 1989 | 4 | 0 |
| 1990 | 8 | 0 |
| 1991 | 8 | 0 |
| 1992 | 6 | 0 |
| 1993 | 17 | 0 |
| 1994 | 11 | 0 |
| 1995 | 6 | 0 |
| 1996 | 14 | 0 |
| 1997 | 9 | 0 |
| 1998 | 16 | 0 |
| 1999 | 18 | 0 |
| 2000 | 19 | 0 |
| 2001 | 20 | 2 |
| 2002 | 14 | 10 |
| 2003 | 19 | 20 |
| 2004 | 13 | 18 |
| 2005 | 14 | 35 |
| 2006 | 26 | 26 |
| 2007 | 20 | 30 |
| 2008 | 27 | 33 |
| 2009 | 26 | 31 |
| 2010 | 32 | 42 |
| 2011 | 28 | 39 |
| 2012 | 29 | 37 |
| 2013 | 27 | 44 |
| 2014 | 31 | 56 |
| 2015 | 21 | 48 |
| 2016 | 26 | 45 |
| 2017 | 48 | 41 |
| 2018 | 39 | 52 |
| 2019 | 44 | 50 |
| 2020 | 39 | 61 |
| 2021 | 41 | 65 |
| 2022 | 45 | 59 |
| 2023 | 48 | 54 |
| 2024 | 46 | 66 |
| 2025 | 42 | 33 |
| 2026 | 31 | 28 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Aerated biological filtration process for water treatment with a view to reducing the nitrogen content (NGL) of said water with reduction of carbon-source and aeration requirements22 Sep 2026US 12,741,895 B2Veolia Water Solutions & Technologies Support
- System and method for treating nitrate nitrogen sewage by constructed wetland15 Sep 2026US 12,735,336 B2Southern University of Science and Technology
- Efficient nitrogen and phosphorus removal process system for mariculture tail water treatment15 Sep 2026US 12,735,339 B2Tianjin Research Institute for Water Transport Engineering, M.O.T.
- Treating produced water for beneficial reuse8 Sep 2026US 12,729,139 B2Renovo Resources LLC
- Apparatus and method for treating waste water1 Sep 2026US 12,722,993 B2Samsung E&A Co., Ltd.
- Strain of paenibacillus glycanilyticus and application thereof in nitrogen removal treatment of nitrogen-containing aquaculture wastewater8 Oct 2026US 2026/0308511 A1Zhejiang Marine Fisheries Research Institute
- Water treatment method and water treatment apparatus1 Oct 2026US 2026/0296934 A1Organo Corporation
- 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
- Method and apparatus for treating wastewater3 Sep 2026US 2026/0257952 A1Samsung E&A Co., Ltd.
Most cited
By later US patents
- Controlled natural purification system for advanced wastewater treatment and protein conversion and recovery229US 4,267,038 A1981
- Process for treating waste water containing cellulose nitrate particles145US 3,939,068 AThe United States of America as represented by the Secretary of the Army · 1976
- Method and apparatus for waste digestion using multiple biological processes124US 5,626,755 AMicronair, Inc. · 1997
- Multiple zone batch treatment process102US 5,192,442 AZimpro Passavant Environmental Systems, Inc. · 1993
- Equipment for treating waste water94US 4,824,563 AMeidensha Corporation · 1989