B01D 24/386
Internal recirculation
Official title: {internal recirculation}
B01D24/386 (Internal recirculation) appears on 22 US grants and 5 published applications in this corpus.
Search patents in B01D- Granted patents
- 22
- Published applications
- 5
- Assignees
- 14
- Inventors
- 34
- Latest grant
- 7 Jan 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 2 |
| 2004 | 0 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Continuous water filtration, disinfection and conservation system7 Jan 2020US 10,526,225 B1Green Crown Water Systems LLC
- Wastewater treatment apparatus including dosing and recirculation chambers within a single tank13 Dec 2005US 6,974,536 B2
- Multi-layer recirculating filter wastewater treatment apparatus9 Sep 2003US 6,616,832 B1Earthtek Environmental Systems, Inc.
- Recirculation of wastewater in a filtration bed1 Apr 2003US 6,540,910 B2
- Clarifier for liquids laden with suspended matter6 Nov 2001US 6,312,592 B1
- Liquid filteration system6 Jan 2022US 2022/0001306 A1
- Method and apparatus for filtration of polluted liquid26 Mar 2020US 2020/0094171 A1M&M Engine AS
- Apparatus and Methods to Recover Media from an Activated Iron Process19 Jul 2018US 2018/0201529 A1Fvoqua Water Technologies LLC
- Wastewater treatment apparatus31 Jul 2003US 2003/0141229 A1
- Recirculation of wastewater in a filtration bed27 Feb 2003US 2003/0038067 A1
Most cited
By later US patents
- Apparatus and method for clarification of water using combined flotation and filtration processes50US 4,377,485 ALenox Institute for Research, Inc. · 1983
- Single cell gas flotation separator with filter media31US 5,516,434 AUnicel, Inc. · 1996
- Recirculating sand filter25US 4,818,384 A1989
- Method of raising sea-water fish, display tank for sea-water fish and tank system for raising sea-water fish23US 5,560,318 AOdi · 1996
- Water-treatment system22US 5,006,240 AAqua Systems Division of Chem-Free, Inc. · 1991