B01D 2201/122
With pleats of different length
Official title: with pleats of different length
B01D2201/122 (With pleats of different length) appears on 49 US grants and 54 published applications in this corpus.
Search patents in B01D- Granted patents
- 49
- Published applications
- 54
- Assignees
- 29
- Inventors
- 109
- Latest grant
- 24 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 2 |
| 2007 | 0 | 5 |
| 2008 | 0 | 3 |
| 2009 | 0 | 2 |
| 2010 | 1 | 3 |
| 2011 | 3 | 1 |
| 2012 | 1 | 0 |
| 2013 | 1 | 3 |
| 2014 | 0 | 1 |
| 2015 | 0 | 3 |
| 2016 | 1 | 5 |
| 2017 | 2 | 3 |
| 2018 | 3 | 6 |
| 2019 | 7 | 3 |
| 2020 | 4 | 4 |
| 2021 | 3 | 2 |
| 2022 | 2 | 2 |
| 2023 | 2 | 1 |
| 2024 | 0 | 0 |
| 2025 | 2 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Curved core for variable pleat filter24 Feb 2026US 12,558,645 B2Donaldson Company, Inc.
- Star pleating with inside out flow having water drainage through the center2 Sep 2025US 12,403,415 B2Parker-Hannifin Corporation
- Periodic radial symmetry for filter pleating14 Jan 2025US 12,194,396 B2Donaldson Company, Inc.
- Fixed rigid wall device for compressed pleat configuration filters12 Sep 2023US 11,752,470 B2EMD Millipore Corporation
- Periodic radial symmetry for filter pleating25 Apr 2023US 11,633,679 B2Donaldson Company, Inc.
- Curved core for variable pleat filter4 Jun 2026US 2026/0151721 A1Donaldson Company, Inc.
- Periodic radial symmetry for filter pleating27 Jul 2023US 2023/0233961 A1Donaldson Company, Inc.
- Curved core for variable pleat filter13 Oct 2022US 2022/0323896 A1Donaldson Company, Inc.
- Star pleating with inside out flow having water drainage through the center23 Jun 2022US 2022/0193579 A1Parker-Hannifin Corporation
- Liquid Filter16 Sep 2021US 2021/0283533 A1Mann+Hummel GmbH
Most cited
By later US patents
- Variant length pleated filter element63US 4,673,503 ATokyo Roki Co., Ltd. · 1987
- Air filter device53US 5,522,909 APurolator Products NA, Inc. · 1996
- Pleated filter element53US 6,315,130 B1Cuno Incorporated · 2001
- Filter hose assembly employing a conical filter element44US 5,632,793 APurolator Products Company · 1997
- Spiral pleated filter cartridges44US 6,598,749 B2Cuno Incorporated · 2003