B01D 2239/065
More than one layer present in the filtering material
B01D2239/065 (More than one layer present in the filtering material) appears on 1,310 US grants and 1,731 published applications in this corpus.
Search patents in B01D- Granted patents
- 1,310
- Published applications
- 1,731
- Assignees
- 843
- Inventors
- 3,567
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 8 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 6 | 0 |
| 1985 | 9 | 0 |
| 1986 | 11 | 0 |
| 1987 | 9 | 0 |
| 1988 | 11 | 0 |
| 1989 | 16 | 0 |
| 1990 | 12 | 0 |
| 1991 | 13 | 0 |
| 1992 | 15 | 0 |
| 1993 | 29 | 0 |
| 1994 | 23 | 0 |
| 1995 | 28 | 0 |
| 1996 | 19 | 0 |
| 1997 | 38 | 0 |
| 1998 | 43 | 0 |
| 1999 | 34 | 0 |
| 2000 | 30 | 0 |
| 2001 | 16 | 5 |
| 2002 | 18 | 17 |
| 2003 | 7 | 18 |
| 2004 | 19 | 30 |
| 2005 | 12 | 17 |
| 2006 | 19 | 32 |
| 2007 | 11 | 48 |
| 2008 | 14 | 44 |
| 2009 | 13 | 43 |
| 2010 | 11 | 64 |
| 2011 | 42 | 69 |
| 2012 | 53 | 42 |
| 2013 | 34 | 54 |
| 2014 | 27 | 63 |
| 2015 | 37 | 58 |
| 2016 | 35 | 87 |
| 2017 | 31 | 66 |
| 2018 | 35 | 67 |
| 2019 | 63 | 88 |
| 2020 | 59 | 106 |
| 2021 | 56 | 149 |
| 2022 | 57 | 163 |
| 2023 | 53 | 168 |
| 2024 | 76 | 94 |
| 2025 | 81 | 75 |
| 2026 | 51 | 64 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01D 2239/0654Support layersIndexing code542
- B01D 2239/0668The layers being joined by heat or melt-bondingIndexing code247
- B01D 2239/0681The layers being joined by gluingIndexing code217
- B01D 2239/0659The layers being joined by needlingIndexing code107
- B01D 2239/0672The layers being joined by weldingIndexing code78
- B01D 2239/0663The layers being joined by hydro-entanglingIndexing code43
- B01D 2239/0677By spot-weldingIndexing code36
- B01D 2239/0686By spot-gluingIndexing code19
Recent patents
- Polyethersulfone fiber webs22 Sep 2026US 12,741,243 B2Hollingsworth & Vose Company
- Oil and fuel collector25 Aug 2026US 12,714,951 B2Manvers Engineering Limited
- Method for manufacturing a metallic functional part delimiting a porous filtering medium, using an additive manufacturing method, and obtained functional part25 Aug 2026US 12,714,960 B2Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Melt-blown nonwoven fabric, method of producing the same, layered body, filter for face mask, and face mask25 Aug 2026US 12,716,153 B2Kaneka Corporation
- Anti-microbial filter18 Aug 2026US 12,708,690 B2Acell Industries Limited
- Filter material, method for producing the filter material, and use of melt-blown polypropylene fibers8 Oct 2026US 2026/0306979 A1Carl Freudenberg KG
- Sanitary mask sheet17 Sep 2026US 2026/0272077 A1Kao Corporation
- Vortical cross-flow filtration system10 Sep 2026US 2026/0263971 A1Cleanr Inc.
- Depth filter10 Sep 2026US 2026/0263976 A1Jnc Corporation
- Depth filter10 Sep 2026US 2026/0263977 A1Jnc Corporation
Most cited
By later US patents
- Melt-blown fibrous web1,019US 5,582,907 APall Corporation · 1996
- 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
- Method of charging electret filter media289US 5,496,507 AMinnesota Mining and Manufacturing Company · 1996
- Strong nonwoven fabrics from engineered multiconstituent fibers282US 5,108,827 AFiberweb North America, Inc. · 1992