B01D 2275/206
Special forms
Official title: Special forms, e.g. adapted to a certain housing
B01D2275/206 (Special forms) appears on 253 US grants and 261 published applications in this corpus.
Search patents in B01D- Granted patents
- 253
- Published applications
- 261
- Assignees
- 114
- Inventors
- 510
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 6 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 2 |
| 2002 | 3 | 2 |
| 2003 | 4 | 3 |
| 2004 | 1 | 11 |
| 2005 | 10 | 4 |
| 2006 | 5 | 7 |
| 2007 | 6 | 6 |
| 2008 | 3 | 7 |
| 2009 | 4 | 7 |
| 2010 | 4 | 10 |
| 2011 | 4 | 4 |
| 2012 | 9 | 12 |
| 2013 | 7 | 12 |
| 2014 | 12 | 6 |
| 2015 | 7 | 14 |
| 2016 | 10 | 16 |
| 2017 | 11 | 27 |
| 2018 | 10 | 10 |
| 2019 | 17 | 23 |
| 2020 | 13 | 12 |
| 2021 | 14 | 14 |
| 2022 | 17 | 10 |
| 2023 | 10 | 15 |
| 2024 | 16 | 13 |
| 2025 | 11 | 6 |
| 2026 | 4 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Filtration assembly and system29 Sep 2026US RE51,044 E1Walk Industrial, Inc.
- Air purifier24 Mar 2026US 12,582,932 B2Brother Kogyo Kabushiki Kaisha
- Outdoor air purifier including at least one filter element17 Mar 2026US 12,576,355 B2Mann+Hummel GmbH
- Filter assemblies and elements utilizing multilayered and wrapped filter media6 Jan 2026US 12,515,162 B2Atmus Filtration IP Inc.
- Arched air filter30 Sep 2025US 12,427,467 B2Cummins Filtration Inc.
- Filter element and filter device3 Sep 2026US 2026/0257162 A1Mann+Hummel GmbH
- Filter element and filter device27 Aug 2026US 2026/0249224 A1Mann+Hummel GmbH
- Filter element and filter system27 Aug 2026US 2026/0249227 A1Mann+Hummel GmbH
- Ring filter element with radially inner engagement contour for angular positioning18 Jun 2026US 2026/0166463 A1Mann+Hummel GmbH
- Filter assemblies and elements utilizing multilayered and wrapped filter media4 Jun 2026US 2026/0151723 A1Atmus Filtration IP Inc.
Most cited
By later US patents
- Composite planar and triangularly pleated filter element307US 4,925,561 ATsuchiya Mfg. Co., Ltd. · 1990
- Increased flow capacity filter234US 6,149,700 ANelson Industries, Inc. · 2000
- Air filter arrangement; assembly; and, methods203US 7,625,419 B2Donaldson Company, Inc. · 2009
- Filter element with end face inlets and discharge outlets148US 6,953,124 B2Mann+Hummel GmbH · 2005
- High flow capacity filter139US 6,261,334 B1Nelson Industries, Inc. · 2001