B04B 5/005
Centrifugal separators or filters for fluid circulation systems
Official title: {Centrifugal separators or filters for fluid circulation systems, e.g. for lubricant oil circulation systems}
B04B5/005 (Centrifugal separators or filters for fluid circulation systems) appears on 215 US grants and 170 published applications in this corpus.
Search patents in B04B- Granted patents
- 215
- Published applications
- 170
- Assignees
- 63
- Inventors
- 258
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 6 | 0 |
| 1998 | 5 | 0 |
| 1999 | 2 | 0 |
| 2000 | 6 | 0 |
| 2001 | 13 | 3 |
| 2002 | 6 | 10 |
| 2003 | 15 | 4 |
| 2004 | 7 | 14 |
| 2005 | 5 | 9 |
| 2006 | 8 | 9 |
| 2007 | 7 | 4 |
| 2008 | 7 | 8 |
| 2009 | 7 | 6 |
| 2010 | 3 | 1 |
| 2011 | 8 | 8 |
| 2012 | 3 | 13 |
| 2013 | 3 | 4 |
| 2014 | 10 | 3 |
| 2015 | 10 | 4 |
| 2016 | 3 | 7 |
| 2017 | 3 | 8 |
| 2018 | 2 | 14 |
| 2019 | 9 | 11 |
| 2020 | 5 | 10 |
| 2021 | 15 | 6 |
| 2022 | 11 | 1 |
| 2023 | 4 | 4 |
| 2024 | 2 | 4 |
| 2025 | 1 | 2 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Engine crankcase ventilation system24 Mar 2026US 12,584,429 B2Grimaldi Development AB
- Shaft mounted centrifugal air-oil separator system24 Jun 2025US 12,337,336 B2Rolls-Royce North American Technologies Inc.
- Electromagnetic turbine and fluid recirculation system5 Nov 2024US 12,134,970 B2
- Rotary vessel with a releasable locking device for a filter assembly29 Oct 2024US 12,128,338 B2Mann+Hummel GmbH
- Intermediate cover of a filter housing of a filter for purifying liquid fluids and filter insert, filter and use12 Dec 2023US 11,839,843 B2Mann+Hummel GmbH
- A method for controlling an electric motor of a centrifugal separator1 Oct 2026US 2026/0295601 A1Alfdex AB
- Method and system for purifying contaminated oil25 Jun 2026US 2026/0175141 A1
- Centrifugal separator arrangement, system and method for energy harvesting in a centrifugal separator arrangement19 Feb 2026US 2026/0048400 A1MANN+HUMMEL Ventures Pte. Ltd.
- Lubricating oil purification system and lubricating oil purification method31 Jul 2025US 2025/0243425 A1Mitsubishi Kakoki Kaisha, Ltd.
- Rotary vessel with a releasable locking device for a filter assembly9 Jan 2025US 2025/0010226 A1Mann+Hummel GmbH
Most cited
By later US patents
- Free jet centrifuge rotor133US 6,530,872 B2Filterwerk Mann & Hummel GmbH · 2003
- Centrifugal filter for removing soot from engine oil84US 6,517,475 B1Analytical Engineering, Inc. · 2003
- Nozzle inlet enhancement for a high speed turbine-driven centrifuge64US 6,019,717 AFleetguard, Inc. · 2000
- Extended life combination filter63US 6,709,575 B1Nelson Industries, Inc. · 2004
- Self-driven, cone-stack type centrifuge56US 5,637,217 AFleetguard, Inc. · 1997