C02F 3/206
With helical screw impellers
Official title: {with helical screw impellers}
C02F3/206 (With helical screw impellers) appears on 39 US grants and 26 published applications in this corpus.
Search patents in C02F- Granted patents
- 39
- Published applications
- 26
- Assignees
- 22
- Inventors
- 64
- Latest grant
- 19 Mar 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 1 | 3 |
| 2010 | 2 | 3 |
| 2011 | 1 | 0 |
| 2012 | 4 | 1 |
| 2013 | 1 | 2 |
| 2014 | 0 | 3 |
| 2015 | 1 | 2 |
| 2016 | 2 | 2 |
| 2017 | 2 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 1 | 1 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
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- Method for treating high-concentration fermentation by-products generated in amino acid fermentation process17 Jul 2025US 2025/0230082 A1Cj Cheiljedang Corporation
- Aeration equipment for wastewater treatment29 Feb 2024US 2024/0066475 A1
- Flow straightening vane for aerator4 Nov 2021US 2021/0340040 A1Aqua-Aerobic Systems, Inc.
- Gas injection method and apparatus19 Jan 2017US 2017/0014782 A1Praxair Technology, Inc.
- Method and system for enhancing mass transfer in aeration/oxygenation systems7 Jul 2016US 2016/0193573 A1
Most cited
By later US patents
- Apparatus and method for aerating liquids51US 3,969,446 A1976
- Gas-liquid venturi mixer49US 5,925,290 ARhone-Poulenc Inc. · 1999
- Process and apparatus for mixing a gas and a liquid46US 4,454,077 AUnion Carbide Corporation · 1984
- Apparatus for contacting a liquid with a gas31US 4,328,175 AUnion Carbide Corporation · 1982
- Submersible in-situ oxygenator31US 6,273,402 B1Praxair Technology, Inc. · 2001