B01D 29/39
Filters with filtering elements stationary during filtration: with hollow discs side by
Official title: with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type
B01D29/39 (Filters with filtering elements stationary during filtration: with hollow discs side by) appears on 323 US grants and 189 published applications in this corpus.
Search patents in B01D- Granted patents
- 323
- Published applications
- 189
- Assignees
- 184
- Inventors
- 499
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 3 | 0 |
| 1978 | 8 | 0 |
| 1979 | 3 | 0 |
| 1980 | 5 | 0 |
| 1981 | 4 | 0 |
| 1982 | 9 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 8 | 0 |
| 1987 | 7 | 0 |
| 1988 | 7 | 0 |
| 1989 | 9 | 0 |
| 1990 | 10 | 0 |
| 1991 | 9 | 0 |
| 1992 | 9 | 0 |
| 1993 | 9 | 0 |
| 1994 | 6 | 0 |
| 1995 | 8 | 0 |
| 1996 | 6 | 0 |
| 1997 | 12 | 0 |
| 1998 | 11 | 0 |
| 1999 | 12 | 0 |
| 2000 | 3 | 0 |
| 2001 | 8 | 0 |
| 2002 | 8 | 6 |
| 2003 | 4 | 20 |
| 2004 | 6 | 14 |
| 2005 | 10 | 8 |
| 2006 | 5 | 7 |
| 2007 | 6 | 9 |
| 2008 | 5 | 8 |
| 2009 | 1 | 7 |
| 2010 | 7 | 12 |
| 2011 | 7 | 11 |
| 2012 | 4 | 9 |
| 2013 | 8 | 9 |
| 2014 | 9 | 6 |
| 2015 | 2 | 7 |
| 2016 | 5 | 10 |
| 2017 | 10 | 6 |
| 2018 | 6 | 6 |
| 2019 | 3 | 5 |
| 2020 | 3 | 5 |
| 2021 | 5 | 8 |
| 2022 | 6 | 4 |
| 2023 | 1 | 4 |
| 2024 | 1 | 3 |
| 2025 | 4 | 1 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Retainer for filters, and leaf disc filter element30 Jun 2026US 12,667,798 B2Fuji Filter Manufacturing Co., Ltd.
- Rotary filter and associated filtering method31 Mar 2026US 12,589,340 B2Gaudfrin
- Filter element for separating solids from liquids and gases23 Dec 2025US 12,502,633 B2DrM, Dr. Muller AG
- Wastewater filters and wastewater filtration systems specifically adapted for their use11 Mar 2025US 12,246,272 B2
- Filter disk segments11 Feb 2025US 12,220,657 B2Pall Corporation
- Rigid filter screen25 Jun 2026US 2026/0175146 A1
- Filter Apparatus21 May 2026US 2026/0138064 A1Solventum Intellectual Properties Company
- Backwashing device for fibrous filtration apparatus and fibrous filtration apparatus including the same14 May 2026US 2026/0131265 A1GRENEX Limited
- Grid structure for filter device22 Jan 2026US 2026/0021429 A1Andritz Separation Inc.
- Multiphase superhydrophobic separator2 Jan 2025US 2025/0001338 A1Irpi LLC
Most cited
By later US patents
- Nanofiber filter media194US 6,872,311 B2Koslow Technologies Corporation · 2005
- Microporous filter media, filtration systems containing same, and methods of making and using143US 6,835,311 B2Koslow Technologies Corporation · 2004
- Microporous filter media, filtration systems containing same, and methods of making and using114US 6,630,016 B2Koslow Technologies Corporation · 2003
- Multiple-disc type filter with extensible support92US 4,642,182 A1987
- Sintered composite medium and filter88US 4,687,579 AThe United States of America as represented by the United States Department of Energy · 1987