B01D 25/21
Plate and frame presses
Official title: Plate and frame presses (B01D25/172, B01D25/176, B01D25/19 take precedence)
B01D25/21 (Plate and frame presses) appears on 175 US grants and 116 published applications in this corpus.
Search patents in B01D- Granted patents
- 175
- Published applications
- 116
- Assignees
- 100
- Inventors
- 252
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 5 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 7 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 9 | 0 |
| 1989 | 9 | 0 |
| 1990 | 9 | 0 |
| 1991 | 7 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 1 |
| 2002 | 2 | 0 |
| 2003 | 1 | 1 |
| 2004 | 1 | 3 |
| 2005 | 3 | 5 |
| 2006 | 0 | 3 |
| 2007 | 3 | 4 |
| 2008 | 2 | 7 |
| 2009 | 3 | 2 |
| 2010 | 2 | 6 |
| 2011 | 4 | 1 |
| 2012 | 2 | 1 |
| 2013 | 3 | 3 |
| 2014 | 0 | 5 |
| 2015 | 2 | 11 |
| 2016 | 2 | 3 |
| 2017 | 6 | 4 |
| 2018 | 5 | 5 |
| 2019 | 3 | 5 |
| 2020 | 2 | 4 |
| 2021 | 7 | 10 |
| 2022 | 6 | 3 |
| 2023 | 4 | 13 |
| 2024 | 2 | 6 |
| 2025 | 7 | 3 |
| 2026 | 8 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Rejector cartridge11 Aug 2026US 12,702,939 B2Evoqua Water Technologies LLC
- Filter plate7 Jul 2026US 12,673,277 B2JVK Filtration Systems GmbH
- Filter press adapter12 May 2026US 12,623,164 B2Takeda Pharmaceutical Company Limited
- Filter plate assembly for a horizontal plate and frame-type filter, such as a tower press, a filter plate and a vat liner12 May 2026US 12,623,165 B2Metso Finland Oy
- Sealing strip for sealing adjacent filter plate assemblies of a filter press, such as a tower press, a filter frame, a filter frame assembly and a filter apparatus5 May 2026US 12,616,923 B2Metso Finland Oy
- A filter plate assembly for a horizontal plate and frame-type filter, such as a tower press, a filter plate and a vat liner20 Aug 2026US 2026/0241310 A1Metso Finland Oy
- Apparatus and process for recovery of a valuable material13 Aug 2026US 2026/0233129 A1Evonik Operations GmbH
- Filtrate collection unit for filter plate in filter presses25 Jun 2026US 2026/0175145 A1Thejo Engineering Limited
- Filter cassette article, and filter comprising same7 May 2026US 2026/0124583 A1Smartflow Technologies, Inc.
- Filter layer29 Jan 2026US 2026/0027500 A1Filtrox AG
Most cited
By later US patents
- Filter plate, filter plate element, and filter comprising same74US 4,882,050 A1989
- Filter plate, filter plate element, and filter comprising same73US 4,867,876 A1989
- Filtration cassette article, and filter comprising same73US 5,342,517 A1994
- Filter plate, filter plate element, and filter comprising same72US 5,034,124 A1991
- Filter plate, filter plate element, and filter comprising same61US 5,049,268 A1991