B01D 2201/188
Multiple filtering elements having filtering areas of different size
B01D2201/188 (Multiple filtering elements having filtering areas of different size) appears on 220 US grants and 178 published applications in this corpus.
Search patents in B01D- Granted patents
- 220
- Published applications
- 178
- Assignees
- 138
- Inventors
- 426
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 6 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 6 | 0 |
| 1988 | 6 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 6 | 0 |
| 1996 | 4 | 0 |
| 1997 | 7 | 0 |
| 1998 | 9 | 0 |
| 1999 | 15 | 0 |
| 2000 | 9 | 0 |
| 2001 | 9 | 3 |
| 2002 | 7 | 17 |
| 2003 | 16 | 17 |
| 2004 | 5 | 14 |
| 2005 | 9 | 15 |
| 2006 | 4 | 15 |
| 2007 | 6 | 8 |
| 2008 | 2 | 4 |
| 2009 | 4 | 8 |
| 2010 | 1 | 6 |
| 2011 | 4 | 7 |
| 2012 | 9 | 2 |
| 2013 | 4 | 2 |
| 2014 | 3 | 5 |
| 2015 | 4 | 6 |
| 2016 | 2 | 3 |
| 2017 | 6 | 5 |
| 2018 | 5 | 9 |
| 2019 | 2 | 5 |
| 2020 | 8 | 8 |
| 2021 | 1 | 3 |
| 2022 | 4 | 4 |
| 2023 | 1 | 2 |
| 2024 | 3 | 2 |
| 2025 | 2 | 6 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for ice bath filtering22 Sep 2026US 12,741,241 B2Lowtemp Industries LLC
- Flexible bag for the preparation of adipose tissue grafts and relative kit17 Mar 2026US 12,576,007 B2Biopsybell S.R.L.
- Pleated fluid filter element and methods3 Jun 2025US 12,318,713 B2Donaldson Company, Inc.
- Multi-structure filtration device for filtering, separating, and dehydrating foreign substances in water18 Mar 2025US 12,251,653 B2
- Recirculation aquaculture system and method31 Dec 2024US 12,178,196 B2Qinghai Photon Ecology Co., Ltd.
- Filter insert with improved filter performance under operating conditions19 Mar 2026US 2026/0077280 A1
- Filter element for use in a filter system15 Jan 2026US 2026/0014497 A1John Crane Inc.
- Filter18 Dec 2025US 2025/0381503 A1ThinkCyte K. K.
- Pleated fluid filter element and methods20 Nov 2025US 2025/0352927 A1Donaldson Company, Inc.
- Water Filter System and Method20 Nov 2025US 2025/0352928 A1
Most cited
By later US patents
- Filter material construction and method335US 5,672,399 ADonaldson Company, Inc. · 1997
- Filter material construction and method190US 6,171,684 B2Donaldson Company, Inc. · 2001
- Oil filter with inner and outer coaxial filter elements140US 5,342,511 ABaldwin Filters, Inc. · 1994
- Filter for subterranean wells109US 5,664,628 APall Corporation · 1997
- Solid-liquid separating filter medium for sewage, waste water, etc81US 5,942,113 A1999