B01D 29/232
With corrugated, folded or wound sheets
Official title: {with corrugated, folded or wound sheets}
B01D29/232 (With corrugated, folded or wound sheets) appears on 223 US grants and 216 published applications in this corpus.
Search patents in B01D- Granted patents
- 223
- Published applications
- 216
- Assignees
- 109
- Inventors
- 437
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 0 |
| 2002 | 3 | 2 |
| 2003 | 1 | 5 |
| 2004 | 2 | 3 |
| 2005 | 2 | 5 |
| 2006 | 2 | 10 |
| 2007 | 4 | 4 |
| 2008 | 2 | 11 |
| 2009 | 3 | 4 |
| 2010 | 5 | 10 |
| 2011 | 7 | 8 |
| 2012 | 12 | 13 |
| 2013 | 8 | 8 |
| 2014 | 5 | 6 |
| 2015 | 9 | 11 |
| 2016 | 5 | 12 |
| 2017 | 9 | 8 |
| 2018 | 4 | 10 |
| 2019 | 10 | 9 |
| 2020 | 13 | 19 |
| 2021 | 8 | 13 |
| 2022 | 11 | 13 |
| 2023 | 12 | 9 |
| 2024 | 9 | 9 |
| 2025 | 6 | 7 |
| 2026 | 3 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Filter device23 Jun 2026US 12,661,607 B2Hydac Filtertechnik 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.
- Alignment notch for an endcap of a filter element19 May 2026US 12,629,615 B2Atmus Filtration IP Inc.
- Water filter14 Oct 2025US 12,440,786 B2Karofi R&D Company Limited
- Star pleating with inside out flow having water drainage through the center2 Sep 2025US 12,403,415 B2Parker-Hannifin Corporation
- Vortical cross-flow filtration system10 Sep 2026US 2026/0263971 A1Cleanr Inc.
- Single piece filtering element for a fluid recirculation system for an air conditioining system such as a system for cooling a battery assembly in particular for electric vehicles6 Aug 2026US 2026/0225007 A1Gvs S. P. A.
- Filter for hydraulic fluids for hydraulic circuits18 Jun 2026US 2026/0166451 A1Mp Filtri S.P.A.
- Filter element with integrated drain filter21 May 2026US 2026/0138060 A1Donaldson Company, Inc.
- Filter for hydraulic fluids for hydraulic circuits19 Mar 2026US 2026/0077281 A1Mp Filtri S.P.A.
Most cited
By later US patents
- Multi-element cylindrical filter with equalized flow185US 6,511,599 B2Nelson Industries, Inc. · 2003
- Compactable filter and compactable filter mounting means93US 5,250,179 APorous Media Corporation · 1993
- Zigzag filter media and frame having triangular pleat stabilizing elements86US 5,531,892 AMinnesota Mining and Manufacturing Company · 1996
- Filter apparatus with cleaning function76US 4,204,961 A1980
- High surface area filter cartridge70US 4,842,739 AMinnesota Mining and Manufacturing Company · 1989