B01D 29/21
With corrugated, folded or wound sheets
Official title: with corrugated, folded or wound sheets
B01D29/21 (With corrugated, folded or wound sheets) appears on 1,330 US grants and 1,259 published applications in this corpus.
Search patents in B01D- Granted patents
- 1,330
- Published applications
- 1,259
- Assignees
- 457
- Inventors
- 2,179
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 10 | 0 |
| 1978 | 15 | 0 |
| 1979 | 9 | 0 |
| 1980 | 7 | 0 |
| 1981 | 8 | 0 |
| 1982 | 3 | 0 |
| 1983 | 8 | 0 |
| 1984 | 5 | 0 |
| 1985 | 12 | 0 |
| 1986 | 7 | 0 |
| 1987 | 18 | 0 |
| 1988 | 8 | 0 |
| 1989 | 10 | 0 |
| 1990 | 11 | 0 |
| 1991 | 6 | 0 |
| 1992 | 15 | 0 |
| 1993 | 19 | 0 |
| 1994 | 15 | 0 |
| 1995 | 17 | 0 |
| 1996 | 18 | 0 |
| 1997 | 39 | 0 |
| 1998 | 38 | 0 |
| 1999 | 42 | 0 |
| 2000 | 27 | 0 |
| 2001 | 28 | 11 |
| 2002 | 23 | 33 |
| 2003 | 40 | 48 |
| 2004 | 26 | 50 |
| 2005 | 36 | 37 |
| 2006 | 29 | 43 |
| 2007 | 25 | 45 |
| 2008 | 17 | 43 |
| 2009 | 12 | 39 |
| 2010 | 18 | 45 |
| 2011 | 30 | 38 |
| 2012 | 47 | 47 |
| 2013 | 34 | 58 |
| 2014 | 27 | 44 |
| 2015 | 24 | 55 |
| 2016 | 28 | 38 |
| 2017 | 33 | 46 |
| 2018 | 37 | 67 |
| 2019 | 52 | 68 |
| 2020 | 63 | 80 |
| 2021 | 55 | 85 |
| 2022 | 75 | 77 |
| 2023 | 65 | 44 |
| 2024 | 57 | 50 |
| 2025 | 49 | 49 |
| 2026 | 24 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Retrofitting and use of rectangular filters, assembly and method for filtration25 Aug 2026US 12,714,957 B2Filtration Technology Corporation
- Filter apparatus with pivotable filter cartridge11 Aug 2026US 12,702,940 B2Robert Bosch GmbH
- Filter assembly with authenticating filter element coupling and replaceable drop-in twist locking filter element therefor2 Jun 2026US 12,643,061 B2Schroeder Industries, Inc.
- Filter element, filter device, arrangement and assembly method26 May 2026US 12,636,600 B2Argo-Hytos Group AG
- Alignment notch for an endcap of a filter element19 May 2026US 12,629,615 B2Atmus Filtration IP Inc.
- Filter element and method for manufacturing a filter element20 Aug 2026US 2026/0241317 A1MANN+HUMMEL Life Sciences & Environment Holding Singapore Pte. Ltd.
- Filter Apparatus and Filter Element6 Aug 2026US 2026/0225012 A1Hydac Filtertechnik GmbH
- Advanced fuel filtration system with interlocking cartridge seal design25 Jun 2026US 2026/0175149 A1Atmus Filtration Inc.
- Filter element and filter with positioning feature11 Jun 2026US 2026/0158425 A1Zhejiang Laien Filtration System Co., Ltd.
- Extruded netting for filters28 May 2026US 2026/0145106 A1DeIStar Technologies, Inc.
Most cited
By later US patents
- Fluid filter system524US 8,272,516 B2Advanced Filtration Systems Inc. · 2012
- Deformable well screen320US 5,901,789 AShell Oil Company · 1999
- Environmentally friendly filter cartridge275US 5,685,985 ABaldwin Filters, Inc. · 1997
- Replacement filter cartridge assembly253US 5,211,846 APleatco Electronic & Filter Corp. · 1993
- Corrugated filter element with external spiral tape support218US 4,402,830 APall Corporation · 1983