C02F 3/20
Using diffusers
Official title: using diffusers
C02F3/20 (Using diffusers) appears on 1,013 US grants and 631 published applications in this corpus.
Search patents in C02F- Granted patents
- 1,013
- Published applications
- 631
- Assignees
- 509
- Inventors
- 1,711
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 31 | 0 |
| 1977 | 31 | 0 |
| 1978 | 26 | 0 |
| 1979 | 18 | 0 |
| 1980 | 27 | 0 |
| 1981 | 33 | 0 |
| 1982 | 15 | 0 |
| 1983 | 9 | 0 |
| 1984 | 17 | 0 |
| 1985 | 18 | 0 |
| 1986 | 18 | 0 |
| 1987 | 9 | 0 |
| 1988 | 15 | 0 |
| 1989 | 22 | 0 |
| 1990 | 24 | 0 |
| 1991 | 26 | 0 |
| 1992 | 26 | 0 |
| 1993 | 19 | 0 |
| 1994 | 21 | 0 |
| 1995 | 13 | 0 |
| 1996 | 25 | 0 |
| 1997 | 19 | 0 |
| 1998 | 13 | 0 |
| 1999 | 17 | 0 |
| 2000 | 16 | 0 |
| 2001 | 18 | 6 |
| 2002 | 17 | 15 |
| 2003 | 14 | 18 |
| 2004 | 15 | 16 |
| 2005 | 9 | 13 |
| 2006 | 13 | 17 |
| 2007 | 17 | 17 |
| 2008 | 11 | 27 |
| 2009 | 12 | 16 |
| 2010 | 23 | 29 |
| 2011 | 17 | 35 |
| 2012 | 25 | 16 |
| 2013 | 21 | 22 |
| 2014 | 12 | 24 |
| 2015 | 18 | 27 |
| 2016 | 16 | 31 |
| 2017 | 26 | 31 |
| 2018 | 18 | 31 |
| 2019 | 18 | 40 |
| 2020 | 41 | 39 |
| 2021 | 27 | 36 |
| 2022 | 27 | 36 |
| 2023 | 35 | 23 |
| 2024 | 18 | 26 |
| 2025 | 24 | 23 |
| 2026 | 13 | 17 |
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
- Biofilm reactor having at least one weighted member22 Sep 2026US 12,741,894 B2
- 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.
- Systems and methods for creating and segmenting treatment processes12 May 2026US 12,623,938 B2Enviromix, Inc.
- MABR-based method for treating rare earth mine tailwater12 May 2026US 12,623,940 B2Guangdong University of Technology
- Systems and methods for creating and segmenting treatment processes10 Sep 2026US 2026/0265095 A1Enviromix, Inc.
- Bioreactor with membrane filtration and methods for treating wastewater10 Sep 2026US 2026/0265098 A1Bl Technologies, Inc.
- Wastewater Treatment Method and System6 Aug 2026US 2026/0225931 A1
- Aerobic Bacterial Generator23 Jul 2026US 2026/0209093 A1Sludgehammer Group, Ltd.
- Systems and methods for water treatment16 Jul 2026US 2026/0200775 A1National University Corporation Kanazawa University
Most cited
By later US patents
- Thermophilic aerobic waste treatment system162US 5,656,155 AIP Holding Company · 1997
- Cyclic aeration system for submerged membrane modules132US 6,245,239 B1Zenon Environmental Inc. · 2001
- Method and apparatus for waste digestion using multiple biological processes124US 5,626,755 AMicronair, Inc. · 1997
- Diffuser/emulsifier124US 6,386,751 B1Diffusion Dynamics, Inc. · 2002
- Cyclic aeration system for submerged membrane modules109US 6,550,747 B2Zenon Environmental Inc. · 2003