C02F 3/306
Denitrification of water in soil
Official title: {Denitrification of water in soil}
C02F3/306 (Denitrification of water in soil) appears on 32 US grants and 25 published applications in this corpus.
Search patents in C02F- Granted patents
- 32
- Published applications
- 25
- Assignees
- 22
- Inventors
- 64
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 2 | 1 |
| 2003 | 3 | 4 |
| 2004 | 2 | 3 |
| 2005 | 0 | 2 |
| 2006 | 2 | 1 |
| 2007 | 1 | 0 |
| 2008 | 1 | 2 |
| 2009 | 1 | 1 |
| 2010 | 1 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 0 | 1 |
| 2016 | 1 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 1 | 2 |
| 2025 | 0 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for treating nitrate nitrogen sewage by constructed wetland15 Sep 2026US 12,735,336 B2Southern University of Science and Technology
- Layered capillary wetting29 Oct 2024US 12,129,195 B2Geomatrix, LLC
- Coagulant composition for wastewater treatment28 Sep 2021US 11,130,687 B2Kemira Oyj
- Wastewater treatment system14 May 2019US 10,287,197 B2
- Method and apparatus for decreasing the content of impurities in raw water7 Feb 2017US 9,561,977 B22Alfa Hydrotech AB
- Self-Blending Pressurized Modular Nitrate Reduction System12 Jun 2025US 2025/0187960 A1ATEC Water Systems, LLC
- Rainwater garden with reduced nitrous oxide emission12 Jun 2025US 2025/0187961 A1Chongqing University
- System and method for treating nitrate nitrogen sewage by constructed wetland22 Aug 2024US 2024/0279097 A1Southern University of Science and Technology
- Water treatment with oil16 May 2024US 2024/0158272 A1Geomatrix, LLC
- Layered Capillary Wetting22 Dec 2022US 2022/0402792 A1Geomatrix, LLC
Most cited
By later US patents
- Method and apparatus for in situ groundwater remediation82US 5,302,286 AThe Board of Trustees of the Leland Stanford Junior University · 1994
- Sewage system for the treatment of segregated domestic waste water54US 4,465,594 A1984
- System and method for removing pollutants from water52US 6,652,743 B2North American Wetland Engineering, Inc. · 2003
- System for removing pollutants from water42US 6,200,469 B1North American Wetland Engineering, Inc. · 2001
- Method for removing pollutants from water38US 6,406,627 B1North American Wetland Engineering, Inc. · 2002