B01D 33/21
With hollow filtering discs transversely mounted on a hollow rotary shaft
Official title: with hollow filtering discs transversely mounted on a hollow rotary shaft
B01D33/21 (With hollow filtering discs transversely mounted on a hollow rotary shaft) appears on 312 US grants and 205 published applications in this corpus.
Search patents in B01D- Granted patents
- 312
- Published applications
- 205
- Assignees
- 165
- Inventors
- 466
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 2 | 0 |
| 1978 | 8 | 0 |
| 1979 | 11 | 0 |
| 1980 | 10 | 0 |
| 1981 | 8 | 0 |
| 1982 | 5 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 15 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 12 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 9 | 0 |
| 1994 | 10 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 16 | 0 |
| 1998 | 10 | 0 |
| 1999 | 10 | 0 |
| 2000 | 10 | 0 |
| 2001 | 7 | 0 |
| 2002 | 5 | 5 |
| 2003 | 3 | 7 |
| 2004 | 4 | 6 |
| 2005 | 1 | 9 |
| 2006 | 4 | 5 |
| 2007 | 3 | 5 |
| 2008 | 3 | 3 |
| 2009 | 3 | 6 |
| 2010 | 1 | 7 |
| 2011 | 3 | 8 |
| 2012 | 5 | 8 |
| 2013 | 6 | 14 |
| 2014 | 8 | 10 |
| 2015 | 4 | 17 |
| 2016 | 12 | 9 |
| 2017 | 8 | 7 |
| 2018 | 6 | 12 |
| 2019 | 8 | 6 |
| 2020 | 4 | 7 |
| 2021 | 12 | 11 |
| 2022 | 7 | 11 |
| 2023 | 6 | 11 |
| 2024 | 9 | 10 |
| 2025 | 5 | 3 |
| 2026 | 4 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Disc filter8 Sep 2026US 12,728,371 B2
- Filter unit lifting system21 Jul 2026US 12,685,949 B2Veolia Water Solutions & Technologies Support
- Bi-directional filter19 May 2026US 12,629,620 B2Combipro AS
- Disc filter having a suction device, and method for filtering fluids using a disc filter3 Mar 2026US 12,564,803 B2Mecana AG
- Continuous disc filter device25 Nov 2025US 12,478,903 B2Valmet Technologies Oy
- Wedge press1 Oct 2026US 2026/0295961 A1Prime Solution, Inc.
- Backwash Orifice Arrangement18 Jun 2026US 2026/0166455 A1Xylem Water Solution U.S.A., Inc.
- Rotary Disc Filter Having a High Pressure Media Cleaning System21 May 2026US 2026/0138065 A1Veolia Water Solutions & Technologies Support
- Backwashing device for fibrous filtration apparatus and fibrous filtration apparatus including the same14 May 2026US 2026/0131265 A1GRENEX Limited
- Filter apparatus and method30 Apr 2026US 2026/0115634 A1
Most cited
By later US patents
- Method and apparatus for cleaning filter material in a filter apparatus utilizing a suction generating nozzle99US 5,951,878 AAqua-Aerobic Systems, Inc. · 1999
- Multi-purpose rotating membrane filter78US 4,925,557 A1990
- Rotary filtration device and filter pack therefor74US 5,254,250 AMembrex, Inc. · 1993
- Rotary disc filtration device73US 5,143,630 AMembrex, Inc. · 1992
- Self-cleaning filter and vortexer68US 4,108,778 A1978