B01D 46/521
Using folded, pleated material
Official title: {using folded, pleated material}
B01D46/521 (Using folded, pleated material) appears on 2,850 US grants and 2,910 published applications in this corpus.
Search patents in B01D- Granted patents
- 2,850
- Published applications
- 2,910
- Assignees
- 886
- Inventors
- 4,455
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 5 | 0 |
| 1978 | 6 | 0 |
| 1979 | 8 | 0 |
| 1980 | 21 | 0 |
| 1981 | 19 | 0 |
| 1982 | 17 | 0 |
| 1983 | 11 | 0 |
| 1984 | 17 | 0 |
| 1985 | 15 | 0 |
| 1986 | 24 | 0 |
| 1987 | 31 | 0 |
| 1988 | 22 | 0 |
| 1989 | 21 | 0 |
| 1990 | 12 | 0 |
| 1991 | 14 | 0 |
| 1992 | 19 | 0 |
| 1993 | 21 | 0 |
| 1994 | 18 | 0 |
| 1995 | 23 | 0 |
| 1996 | 34 | 0 |
| 1997 | 44 | 0 |
| 1998 | 58 | 0 |
| 1999 | 54 | 0 |
| 2000 | 64 | 0 |
| 2001 | 64 | 21 |
| 2002 | 66 | 71 |
| 2003 | 54 | 73 |
| 2004 | 63 | 87 |
| 2005 | 56 | 80 |
| 2006 | 54 | 81 |
| 2007 | 51 | 88 |
| 2008 | 45 | 108 |
| 2009 | 46 | 99 |
| 2010 | 58 | 108 |
| 2011 | 109 | 105 |
| 2012 | 103 | 107 |
| 2013 | 105 | 98 |
| 2014 | 94 | 135 |
| 2015 | 75 | 120 |
| 2016 | 103 | 113 |
| 2017 | 88 | 155 |
| 2018 | 83 | 145 |
| 2019 | 156 | 131 |
| 2020 | 140 | 167 |
| 2021 | 120 | 168 |
| 2022 | 119 | 169 |
| 2023 | 117 | 139 |
| 2024 | 125 | 138 |
| 2025 | 104 | 120 |
| 2026 | 67 | 84 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Filter systems for room air conditioners29 Sep 2026US 12,746,494 B2Rheem Manufacturing Company
- Filter media, filter media packs, and filter elements29 Sep 2026US 12,746,500 B2Donaldson Company, Inc.
- Filtration assembly and system29 Sep 2026US RE51,044 E1Walk Industrial, Inc.
- Polyethersulfone fiber webs22 Sep 2026US 12,741,243 B2Hollingsworth & Vose Company
- Embedding variable slit width embossed filter media packs15 Sep 2026US 12,734,471 B2Baldwin Filters, Inc.
- Automotive air filters with hydrocarbon-absorbing media8 Oct 2026US 2026/0306983 A1
- Embedded pleat face stabilizing structure for deep pleated embossed heavy duty panel air media packs and/or end cap catch feature8 Oct 2026US 2026/0306985 A1Baldwin Filters, Inc.
- Filter element for use with dust collector & other applications8 Oct 2026US 2026/0306986 A1Donaldson Company, Inc.
- Air Filter8 Oct 2026US 2026/0309346 A1Zhongshan Scott Clean&Purification Co., Ltd.
- Active precleaner system and methods of use24 Sep 2026US 2026/0284565 A1Donaldson Company, Inc.
Most cited
By later US patents
- Inline filter apparatus526US 5,820,646 ADonaldson Company, Inc. · 1998
- Filter arrangement; sealing system; and methods402US 6,190,432 B1Donaldson Company, Inc. · 2001
- Filter element incorporating a handle member390US 6,235,195 B1Donaldson Company, Inc. · 2001
- Air filtration arrangements having fluted media constructions and methods381US 6,673,136 B2Donaldson Company, Inc. · 2004
- Air filter arrangement having first and second filter media dividing a housing and methods343US 6,210,469 B1Donaldson Company, Inc. · 2001