C02F 3/308
Biological phosphorus removal
Official title: {Biological phosphorus removal}
C02F3/308 (Biological phosphorus removal) appears on 375 US grants and 329 published applications in this corpus.
Search patents in C02F- Granted patents
- 375
- Published applications
- 329
- Assignees
- 250
- Inventors
- 960
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 6 | 0 |
| 1994 | 8 | 0 |
| 1995 | 6 | 0 |
| 1996 | 10 | 0 |
| 1997 | 11 | 0 |
| 1998 | 13 | 0 |
| 1999 | 6 | 0 |
| 2000 | 10 | 0 |
| 2001 | 4 | 2 |
| 2002 | 8 | 9 |
| 2003 | 10 | 10 |
| 2004 | 11 | 8 |
| 2005 | 3 | 11 |
| 2006 | 8 | 10 |
| 2007 | 11 | 11 |
| 2008 | 13 | 6 |
| 2009 | 9 | 7 |
| 2010 | 7 | 13 |
| 2011 | 10 | 7 |
| 2012 | 6 | 13 |
| 2013 | 6 | 16 |
| 2014 | 12 | 24 |
| 2015 | 9 | 17 |
| 2016 | 11 | 15 |
| 2017 | 11 | 10 |
| 2018 | 11 | 15 |
| 2019 | 10 | 12 |
| 2020 | 12 | 18 |
| 2021 | 13 | 31 |
| 2022 | 17 | 12 |
| 2023 | 19 | 15 |
| 2024 | 15 | 19 |
| 2025 | 6 | 11 |
| 2026 | 6 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Device for influent distribution and thickened sludge fermentation to enhance MSBR system6 Oct 2026US 12,753,100 B2Corstar Environmental Equipment Shanghai Ltd
- 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.
- Inclined plate baffled A2O reactor with high oxygen transfer efficiency28 Apr 2026US 12,612,322 B2Yuxi Normal University
- Straight-line sewage treatment system for enhanced treatment of low C/N domestic sewage31 Mar 2026US 12,590,019 B2Tongji University
- Integrated dual circulation oxidization ditch apparatus for municipal wastewater and treatment method3 Mar 2026US 12,565,435 B2Guizhou University
- Wastewater treatment systems and methods involving a biologically active conduit21 May 2026US 2026/0138902 A1
- System and method for removal of phosphorus from a water source21 May 2026US 2026/0138903 A1University of Massachusetts
- Method for removal of nitrate from wastewater effluent30 Apr 2026US 2026/0116800 A1
- Water treatment apparatus23 Apr 2026US 2026/0109623 A1Kubota Corporation
- Water treatment apparatus23 Apr 2026US 2026/0109627 A1Kubota Corporation
Most cited
By later US patents
- Environmental control for biological nutrient removal in water/wastewater treatment129US 5,733,456 A1998
- High-rate biological waste water treatment process using activated sludge recycle123US 4,867,883 AHampton Roads Sanitation District of the Commonwealth of Virginia · 1989
- Controlling wastewater treatment by monitoring oxygen utilization rates107US 5,989,428 A1999
- Control of activated sludge wastewater treating process for enhanced phosphorous removal105US 4,271,026 AAir Products and Chemicals, Inc. · 1981
- Membrane module for gas transfer and membrane supported biofilm process99US 6,645,374 B2Zenon Environmental Inc. · 2003