B01D 24/20
The filtering material being provided in an open container
Official title: the filtering material being provided in an open container
B01D24/20 (The filtering material being provided in an open container) appears on 385 US grants and 209 published applications in this corpus.
Search patents in B01D- Granted patents
- 385
- Published applications
- 209
- Assignees
- 178
- Inventors
- 483
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 4 | 0 |
| 1980 | 11 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 2 | 0 |
| 1984 | 10 | 0 |
| 1985 | 3 | 0 |
| 1986 | 10 | 0 |
| 1987 | 2 | 0 |
| 1988 | 9 | 0 |
| 1989 | 6 | 0 |
| 1990 | 7 | 0 |
| 1991 | 8 | 0 |
| 1992 | 19 | 0 |
| 1993 | 15 | 0 |
| 1994 | 11 | 0 |
| 1995 | 6 | 0 |
| 1996 | 10 | 0 |
| 1997 | 13 | 0 |
| 1998 | 8 | 0 |
| 1999 | 4 | 0 |
| 2000 | 9 | 0 |
| 2001 | 13 | 3 |
| 2002 | 5 | 8 |
| 2003 | 6 | 10 |
| 2004 | 9 | 9 |
| 2005 | 6 | 6 |
| 2006 | 12 | 6 |
| 2007 | 4 | 6 |
| 2008 | 2 | 6 |
| 2009 | 3 | 6 |
| 2010 | 6 | 5 |
| 2011 | 8 | 5 |
| 2012 | 5 | 7 |
| 2013 | 5 | 8 |
| 2014 | 7 | 17 |
| 2015 | 11 | 14 |
| 2016 | 9 | 13 |
| 2017 | 8 | 6 |
| 2018 | 15 | 12 |
| 2019 | 13 | 18 |
| 2020 | 18 | 8 |
| 2021 | 15 | 12 |
| 2022 | 5 | 3 |
| 2023 | 4 | 3 |
| 2024 | 5 | 8 |
| 2025 | 4 | 5 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01D 24/24Downward filtration, the container having distribution or collection headers or pervious conduits194
- B01D 24/22Downward filtration, the filter material being supported by pervious surfaces126
- B01D 24/26Upward filtration49
- B01D 24/205Downward filtration without specifications about the filter material supporting means43
Recent patents
- Aquarium skimmer devices, systems, and methods4 Aug 2026US 12,696,882 B2
- Biofilter with shaped underdrain assembly12 May 2026US 12,623,939 B2Johnson Screens, Inc.
- 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.
- Solid-liquid filtration assembly and method of use25 Nov 2025US 12,478,900 B2
- Media retention plate for a block underdrain system11 Mar 2025US 12,246,271 B2De Nora Water Technologies, LLC
- Systems and Methods for Stormwater Treatment6 Aug 2026US 2026/0225917 A1Geostorage Corporation
- Waste water treatment system25 Jun 2026US 2026/0175147 A1Altinay Savunma Teknolojileri Anonim Sirketi
- Method and System for Anchoring an Underdrain21 May 2026US 2026/0138055 A1Xylem Water Solutions Zelienople LLC
- 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.
- Water Filter Priming Bag Apparatus, Systems and Methods19 Feb 2026US 2026/0048919 A1Clearly Filtered, Inc.
Most cited
By later US patents
- Method and apparatus for treating stormwater runoff122US 6,277,274 B12001
- Method and apparatus for treating storm water107US 5,322,629 AW & H Pacific Inc. · 1994
- Apparatus for uniformly distributing gas and/or liquid in an underdrain lateral system83US 5,156,738 AJohnson Filtration Systems Inc. · 1992
- 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
- Filter underdrain apparatus with partitioned distributor conduits62US 5,019,259 A1991