C02F 3/2873
With internal draft tube circulation
Official title: {with internal draft tube circulation}
C02F3/2873 (With internal draft tube circulation) appears on 57 US grants and 44 published applications in this corpus.
Search patents in C02F- Granted patents
- 57
- Published applications
- 44
- Assignees
- 50
- Inventors
- 140
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 1 |
| 2002 | 1 | 1 |
| 2003 | 2 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 3 |
| 2006 | 0 | 1 |
| 2007 | 3 | 2 |
| 2008 | 1 | 2 |
| 2009 | 3 | 4 |
| 2010 | 2 | 1 |
| 2011 | 2 | 1 |
| 2012 | 1 | 2 |
| 2013 | 2 | 5 |
| 2014 | 2 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 4 |
| 2019 | 1 | 5 |
| 2020 | 2 | 1 |
| 2021 | 4 | 0 |
| 2022 | 2 | 1 |
| 2023 | 1 | 3 |
| 2024 | 2 | 2 |
| 2025 | 2 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Slightly heavy particle system for wastewater treatment18 Nov 2025US 12,473,217 B2Wesdon-Tienda Environmental Sciences Co. Ltd.
- High-precision, high-efficiency recirculation system for preserving multiple-density biomass and attached biofilm in wastewater treatment bioreactors1 Jul 2025US 12,344,541 B2
- Anaerobic waste water purification tower28 May 2024US 11,993,525 B2Waterleau Group NV
- Systems, devices and methods for anaerobically treating wastewater23 Apr 2024US 11,964,891 B2
- Large bubble mixer and method of using same in a wastewater treatment system19 Dec 2023US 11,845,043 B2Environmental Dynamics International, Inc.
- Fixed film bioreactor for purification of water and associated methods1 Oct 2026US 2026/0296937 A1WesTech Engineering, Inc.
- Two-phase sulfate reduction device and treatment method for preventing sludge calcification20 Nov 2025US 2025/0353766 A1Nanjing University
- Device and method for purifying wastewater24 Oct 2024US 2024/0351925 A1Nxo Engineering
- Apparatus and method for accelerating the granulation of sludge17 Oct 2024US 2024/0343622 A1Bkt Co., Ltd.
- Anaerobic waste water purification tower21 Sep 2023US 2023/0295025 A1Waterleau Group NV
Most cited
By later US patents
- Method and apparatus for treating stormwater runoff122US 6,277,274 B12001
- Method and apparatus for treating stormwater runoff54US 6,569,321 B22003
- Method for anaerobic sludge digestion47US 5,409,610 A1995
- Treatment of contaminated water30US 5,876,606 AUniversity of Waterloo · 1999
- Apparatus for anaerobic purification of waste water24US 5,013,431 AMeyn Machinefabriek B.V. · 1991