B01D 2239/06
Filter cloth
Official title: Filter cloth, e.g. knitted, woven non-woven; self-supported material
B01D2239/06 (Filter cloth) appears on 1,771 US grants and 2,418 published applications in this corpus.
Search patents in B01D- Granted patents
- 1,771
- Published applications
- 2,418
- Assignees
- 1,101
- Inventors
- 4,794
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 11 | 0 |
| 1979 | 6 | 0 |
| 1980 | 10 | 0 |
| 1981 | 9 | 0 |
| 1982 | 3 | 0 |
| 1983 | 5 | 0 |
| 1984 | 9 | 0 |
| 1985 | 12 | 0 |
| 1986 | 13 | 0 |
| 1987 | 11 | 0 |
| 1988 | 15 | 0 |
| 1989 | 20 | 0 |
| 1990 | 16 | 0 |
| 1991 | 14 | 0 |
| 1992 | 21 | 0 |
| 1993 | 36 | 0 |
| 1994 | 29 | 0 |
| 1995 | 38 | 0 |
| 1996 | 23 | 0 |
| 1997 | 49 | 0 |
| 1998 | 48 | 0 |
| 1999 | 43 | 0 |
| 2000 | 37 | 0 |
| 2001 | 22 | 8 |
| 2002 | 22 | 24 |
| 2003 | 10 | 25 |
| 2004 | 21 | 42 |
| 2005 | 17 | 28 |
| 2006 | 21 | 47 |
| 2007 | 15 | 55 |
| 2008 | 16 | 56 |
| 2009 | 24 | 61 |
| 2010 | 21 | 87 |
| 2011 | 50 | 88 |
| 2012 | 61 | 72 |
| 2013 | 46 | 75 |
| 2014 | 41 | 81 |
| 2015 | 48 | 87 |
| 2016 | 49 | 117 |
| 2017 | 41 | 96 |
| 2018 | 43 | 94 |
| 2019 | 95 | 121 |
| 2020 | 76 | 152 |
| 2021 | 89 | 208 |
| 2022 | 84 | 219 |
| 2023 | 75 | 226 |
| 2024 | 112 | 140 |
| 2025 | 114 | 117 |
| 2026 | 75 | 92 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01D 2239/065More than one layer present in the filtering materialIndexing code1,310
- B01D 2239/0604Arrangement of the fibres in the filtering materialIndexing code1,041
- B01D 2239/069Special geometry of layersIndexing code302
- B01D 2239/0645Arrangement of the particles in the filtering materialIndexing code16
Recent patents
- Polyethersulfone fiber webs22 Sep 2026US 12,741,243 B2Hollingsworth & Vose Company
- Personal protective anti-viral face mask15 Sep 2026US 12,734,378 B2lowa State University Research Foundation, Inc.
- Preparation method of bismuth ion filter membrane and application thereof15 Sep 2026US 12,734,470 B2Work Together Marketing Consultant Limited
- High efficiency synthetic filter media1 Sep 2026US 12,722,107 B2Knowlton Technologies, LLC
- Oil and fuel collector25 Aug 2026US 12,714,951 B2Manvers Engineering Limited
- Multifunctional filter materials8 Oct 2026US 2026/0305741 A1Khalifa University of Science and Technology
- Filter material, method for producing the filter material, and use of melt-blown polypropylene fibers8 Oct 2026US 2026/0306979 A1Carl Freudenberg KG
- Method for preparing a composite filter medium and the composite filter medium obtained with this method1 Oct 2026US 2026/0295484 A1Saati S.P.A.
- Sanitary mask sheet17 Sep 2026US 2026/0272077 A1Kao Corporation
- Methods of reducing the enzymatic hydrolysis activity rate in a composition obtained from a purification platform17 Sep 2026US 2026/0274889 A1Genentech, Inc.
Most cited
By later US patents
- Melt-blown fibrous web1,019US 5,582,907 APall Corporation · 1996
- Blood filter and method of filtration941US 5,190,657 ALydall, Inc. · 1993
- Web of blended microfibers and crimped bulking fibers445US 4,118,531 AMinnesota Mining and Manufacturing Company · 1978
- Deformable well screen320US 5,901,789 AShell Oil Company · 1999
- Bicomponent fibers and webs made therefrom302US 4,795,668 AMinnesota Mining and Manufacturing Company · 1989