B01D 24/4631
Counter-current flushing
Official title: {Counter-current flushing, e.g. by air}
B01D24/4631 (Counter-current flushing) appears on 543 US grants and 314 published applications in this corpus.
Search patents in B01D- Granted patents
- 543
- Published applications
- 314
- Assignees
- 271
- Inventors
- 713
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 10 | 0 |
| 1978 | 12 | 0 |
| 1979 | 6 | 0 |
| 1980 | 15 | 0 |
| 1981 | 6 | 0 |
| 1982 | 9 | 0 |
| 1983 | 6 | 0 |
| 1984 | 14 | 0 |
| 1985 | 8 | 0 |
| 1986 | 13 | 0 |
| 1987 | 9 | 0 |
| 1988 | 10 | 0 |
| 1989 | 6 | 0 |
| 1990 | 8 | 0 |
| 1991 | 13 | 0 |
| 1992 | 28 | 0 |
| 1993 | 16 | 0 |
| 1994 | 17 | 0 |
| 1995 | 14 | 0 |
| 1996 | 13 | 0 |
| 1997 | 11 | 0 |
| 1998 | 12 | 0 |
| 1999 | 7 | 0 |
| 2000 | 9 | 0 |
| 2001 | 17 | 6 |
| 2002 | 9 | 13 |
| 2003 | 8 | 12 |
| 2004 | 10 | 17 |
| 2005 | 5 | 11 |
| 2006 | 15 | 10 |
| 2007 | 12 | 9 |
| 2008 | 6 | 7 |
| 2009 | 4 | 5 |
| 2010 | 5 | 10 |
| 2011 | 7 | 16 |
| 2012 | 9 | 5 |
| 2013 | 3 | 13 |
| 2014 | 13 | 15 |
| 2015 | 7 | 18 |
| 2016 | 14 | 19 |
| 2017 | 10 | 15 |
| 2018 | 15 | 18 |
| 2019 | 18 | 10 |
| 2020 | 8 | 17 |
| 2021 | 19 | 15 |
| 2022 | 12 | 14 |
| 2023 | 14 | 17 |
| 2024 | 7 | 11 |
| 2025 | 13 | 6 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Regenerable system and method for filtering microfibres from a waste liquid22 Sep 2026US 12,742,277 B2Ifp Energies Nouvelles
- Lightweight fibrous media (LFM) filter31 Mar 2026US 12,589,336 B1
- Devices and methods for moving, removing and/or installing one or more components of a treatment unit9 Dec 2025US 12,491,454 B2Roberts Marketing DE, Inc.
- Portable filter cleaning system and method of cleaning a filter21 Oct 2025US 12,447,421 B2Cyclone Filter Tools LLC
- Portable pool filter cleaning system and method of cleaning a pool filter5 Aug 2025US 12,377,369 B2Cyclone Filter Tools LLC
- Adjustable weir for a collection trough, a collection trough and a collection trough assembly24 Sep 2026US 2026/0284558 A1Roberts Water Technologies, Inc.
- Method and System for Anchoring an Underdrain21 May 2026US 2026/0138055 A1Xylem Water Solutions Zelienople LLC
- Filtration apparatus30 Apr 2026US 2026/0115630 A1Nihon Genryo Co., Ltd.
- Devices and methods for moving, removing and/or installing one or more components of a treatment unit5 Mar 2026US 2026/0061345 A1Roberts Marketing DE, Inc.
- Portable Filter Cleaning System And Method Of Cleaning A Filter12 Feb 2026US 2026/0042038 A1Cyclone Filter Tools LLC
Most cited
By later US patents
- Method and apparatus for acoustically driven media filtration86US 6,221,258 B1Case Western Reserve University · 2001
- Apparatus for uniformly distributing gas and/or liquid in an underdrain lateral system83US 5,156,738 AJohnson Filtration Systems Inc. · 1992
- Combined air/water backwash in a travelling bridge filter83US 5,401,405 ADavis Water & Waste Industries, Inc. · 1995
- Water filtration process and apparatus having upflow filter with buoyant filter media and downflow filter with nonbuoyant filter media70US 4,547,286 ANeptune Microfloc, Inc. · 1985
- Deep bed filter68US 4,197,205 A1980