B01D 2201/291
End caps
B01D2201/291 (End caps) appears on 1,086 US grants and 1,470 published applications in this corpus.
Search patents in B01D- Granted patents
- 1,086
- Published applications
- 1,470
- Assignees
- 351
- Inventors
- 1,786
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 5 | 0 |
| 2000 | 8 | 0 |
| 2001 | 5 | 4 |
| 2002 | 3 | 7 |
| 2003 | 15 | 18 |
| 2004 | 13 | 20 |
| 2005 | 10 | 24 |
| 2006 | 14 | 39 |
| 2007 | 12 | 45 |
| 2008 | 17 | 36 |
| 2009 | 18 | 58 |
| 2010 | 22 | 46 |
| 2011 | 33 | 56 |
| 2012 | 48 | 53 |
| 2013 | 48 | 75 |
| 2014 | 37 | 62 |
| 2015 | 44 | 59 |
| 2016 | 38 | 66 |
| 2017 | 52 | 78 |
| 2018 | 66 | 76 |
| 2019 | 77 | 81 |
| 2020 | 77 | 124 |
| 2021 | 57 | 92 |
| 2022 | 95 | 110 |
| 2023 | 85 | 59 |
| 2024 | 70 | 73 |
| 2025 | 65 | 55 |
| 2026 | 34 | 54 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Filter cartridge and water purification system22 Sep 2026US 12,741,249 B2Foshan Micro Midea Filter Mfg. Co., Ltd.
- Filter cartridge and filter having same25 Aug 2026US 12,714,954 B2Solventum Intellectual Properties Company
- Retrofitting and use of rectangular filters, assembly and method for filtration25 Aug 2026US 12,714,957 B2Filtration Technology Corporation
- Fluid filter retention mechanism18 Aug 2026US 12,708,869 B2Caterpillar Inc.
- Filter apparatus with pivotable filter cartridge11 Aug 2026US 12,702,940 B2Robert Bosch GmbH
- Filter assemblies and related filter elements8 Oct 2026US 2026/0306974 A1Donaldson Company, Inc.
- Filter arrangements for liquids and methods of use1 Oct 2026US 2026/0295475 A1Donaldson Company, Inc.
- Filter Element with Biplanar O-Ring1 Oct 2026US 2026/0295481 A1Parker-Hannifin Corporation
- Filter interconnect utilizing a magnetic repulsion force1 Oct 2026US 2026/0295483 A1KX Technologies LLC
- Filter element endplate oriented on head in filter24 Sep 2026US 2026/0284559 A1Atmus Filtration Inc.
Most cited
By later US patents
- Fluid filter system524US 8,272,516 B2Advanced Filtration Systems Inc. · 2012
- Environmentally friendly filter cartridge275US 5,685,985 ABaldwin Filters, Inc. · 1997
- Personal water filter bottle system161US 6,569,329 B1Innova Pure Water Inc. · 2003
- Recharge and filter assembly with replaceable cartridge131US 6,235,194 B1Parker-Hannifin Corporation · 2001
- Fuel filter assembly with in-line valve99US 5,858,227 AParker-Hannifin Corporation · 1999