B01D 24/18
Combined upward and downward filtration
B01D24/18 (Combined upward and downward filtration) appears on 29 US grants and 22 published applications in this corpus.
Search patents in B01D- Granted patents
- 29
- Published applications
- 22
- Assignees
- 24
- Inventors
- 60
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 1 |
| 2019 | 0 | 3 |
| 2020 | 1 | 0 |
| 2021 | 0 | 3 |
| 2022 | 4 | 5 |
| 2023 | 2 | 1 |
| 2024 | 1 | 0 |
| 2025 | 4 | 4 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Non-discharge backwash filter system17 Feb 2026US 12,551,826 B1Crescent Gdg Filter Venture, LLC
- Underdrain filtered water collection systems with winged screen diffusers26 Aug 2025US 12,397,247 B2De Nora Water Technologies, LLC
- Filter device17 Jun 2025US 12,330,091 B2Bluewater Sweden AB
- Method of purifying natural water and wastewater25 Feb 2025US 12,234,170 B2
- Solvent-extract filter apparatuses and methods4 Feb 2025US 12,214,295 B2Gene Pool Technologies, Inc.
- Deionization filter assembly with cylinder-in-cylinder design25 Dec 2025US 2025/0387730 A1Cummins Filtration Inc.
- Automated and self-cleaning gravel pack filter system for water treatment and disposal5 Jun 2025US 2025/0177895 A1Saudi Arabian Oil Company
- Underdrain Filtered Water Collection Systems with Winged Screen Diffusers29 May 2025US 2025/0170499 A1De Nora Water Technologies, LLC
- Solvent-extract filter apparatuses and methods24 Apr 2025US 2025/0128185 A1Gene Pool Technologies, Inc.
- Solvent-extract filter apparatuses and methods4 May 2023US 2023/0139489 A1Gene Pool Technologies, Inc.
Most cited
By later US patents
- 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
- Sequential flow filtration chamber for treatment of waste water and associated method29US 6,383,372 B12002
- Process and device for the filtration of liquids polluted by suspended solid bodies25US 4,052,300 AItalba, S.p.A. · 1977
- Filter24US 4,552,657 ASuisaku Kabushiki Kaisha · 1985
- Liquid sand filter21US 4,246,119 A1981