B01D 46/523
With means for maintaining spacing between the pleats or folds
Official title: {with means for maintaining spacing between the pleats or folds}
B01D46/523 (With means for maintaining spacing between the pleats or folds) appears on 409 US grants and 377 published applications in this corpus.
Search patents in B01D- Granted patents
- 409
- Published applications
- 377
- Assignees
- 190
- Inventors
- 784
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 4 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 6 | 0 |
| 1986 | 6 | 0 |
| 1987 | 8 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 1 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 6 | 0 |
| 1998 | 11 | 0 |
| 1999 | 9 | 0 |
| 2000 | 12 | 0 |
| 2001 | 9 | 7 |
| 2002 | 11 | 7 |
| 2003 | 9 | 12 |
| 2004 | 8 | 15 |
| 2005 | 10 | 12 |
| 2006 | 9 | 6 |
| 2007 | 8 | 9 |
| 2008 | 6 | 11 |
| 2009 | 3 | 4 |
| 2010 | 3 | 12 |
| 2011 | 10 | 9 |
| 2012 | 12 | 16 |
| 2013 | 10 | 18 |
| 2014 | 11 | 21 |
| 2015 | 10 | 23 |
| 2016 | 18 | 15 |
| 2017 | 10 | 19 |
| 2018 | 11 | 18 |
| 2019 | 20 | 16 |
| 2020 | 19 | 23 |
| 2021 | 18 | 22 |
| 2022 | 8 | 21 |
| 2023 | 21 | 18 |
| 2024 | 21 | 22 |
| 2025 | 12 | 8 |
| 2026 | 9 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Annular unframed pleated air filter28 Jul 2026US 12,691,401 B23M Innovative Properties Company
- Zigzag-folded nonwoven material16 Jun 2026US 12,654,122 B2Irema-Filter GmbH
- Compact room air purifier with integrated gaskets26 May 2026US 12,636,601 B23M Innovative Properties Company
- Air purifier19 May 2026US 12,631,351 B2Sharp Kabushiki Kaisha
- Filter element with improved dust loading5 May 2026US 12,616,928 B2Donaldson Company, Inc.
- 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.
- Air Filter8 Oct 2026US 2026/0309346 A1Zhongshan Scott Clean&Purification Co., Ltd.
- Filter element and method for manufacturing a filter element20 Aug 2026US 2026/0241317 A1MANN+HUMMEL Life Sciences & Environment Holding Singapore Pte. Ltd.
- Filter element23 Jul 2026US 2026/0208090 A1Mann+Hummel GmbH
- Variable height, offset, angled & bridged embossment16 Jul 2026US 2026/0199811 A1Baldwin Filters, Inc.
Most cited
By later US patents
- Polymer, polymer microfiber, polymer nanofiber and applications including filter structures252US 6,743,273 B2Donaldson Company, Inc. · 2004
- Increased flow capacity filter234US 6,149,700 ANelson Industries, Inc. · 2000
- Filter construction resistant to the passage of water soluble materials; and method221US 6,123,751 ADonaldson Company, Inc. · 2000
- Filter material construction and method190US 6,171,684 B2Donaldson Company, Inc. · 2001
- Crimp seal pleated filter assembly170US 4,617,122 ADonaldson Company, Inc. · 1986