B01D 2239/04
Additives and treatments of the filtering material
B01D2239/04 (Additives and treatments of the filtering material) appears on 1,629 US grants and 2,192 published applications in this corpus.
Search patents in B01D- Granted patents
- 1,629
- Published applications
- 2,192
- Assignees
- 1,147
- Inventors
- 5,025
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 8 | 0 |
| 1978 | 10 | 0 |
| 1979 | 8 | 0 |
| 1980 | 8 | 0 |
| 1981 | 14 | 0 |
| 1982 | 6 | 0 |
| 1983 | 8 | 0 |
| 1984 | 10 | 0 |
| 1985 | 11 | 0 |
| 1986 | 14 | 0 |
| 1987 | 12 | 0 |
| 1988 | 15 | 0 |
| 1989 | 15 | 0 |
| 1990 | 20 | 0 |
| 1991 | 14 | 0 |
| 1992 | 18 | 0 |
| 1993 | 35 | 0 |
| 1994 | 33 | 0 |
| 1995 | 35 | 0 |
| 1996 | 24 | 0 |
| 1997 | 43 | 0 |
| 1998 | 38 | 0 |
| 1999 | 44 | 0 |
| 2000 | 33 | 0 |
| 2001 | 26 | 10 |
| 2002 | 20 | 22 |
| 2003 | 18 | 19 |
| 2004 | 23 | 43 |
| 2005 | 14 | 30 |
| 2006 | 16 | 55 |
| 2007 | 18 | 49 |
| 2008 | 21 | 49 |
| 2009 | 23 | 48 |
| 2010 | 22 | 61 |
| 2011 | 37 | 75 |
| 2012 | 33 | 61 |
| 2013 | 35 | 57 |
| 2014 | 30 | 59 |
| 2015 | 32 | 62 |
| 2016 | 39 | 54 |
| 2017 | 34 | 80 |
| 2018 | 27 | 93 |
| 2019 | 61 | 110 |
| 2020 | 75 | 125 |
| 2021 | 74 | 232 |
| 2022 | 74 | 233 |
| 2023 | 94 | 233 |
| 2024 | 100 | 146 |
| 2025 | 123 | 119 |
| 2026 | 80 | 67 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01D 2239/0471Surface coating materialIndexing code744
- B01D 2239/0414Surface modifiersIndexing code441
- B01D 2239/0407Comprising particulate additivesIndexing code438
- B01D 2239/0442Antimicrobial, antibacterial, antifungal additivesIndexing code276
- B01D 2239/0435ElectretIndexing code254
- B01D 2239/0464ImpregnantsIndexing code190
- B01D 2239/0457Specific fire retardant or heat resistant propertiesIndexing code137
- B01D 2239/045Deodorising additivesIndexing code61
Recent patents
- Method for adjusting grouting parameters in preparation of ceramic composite fiber-based catalytic filter tube, and method and device for preparing ceramic composite fiber-based catalytic filter tube6 Oct 2026US 12,752,223 B2Zhejiang Zhiyuan Environmental Technology Co., Ltd
- Substrate treatments29 Sep 2026US 12,746,490 B2Donaldson Company, Inc.
- Granulated hierarchical material structure29 Sep 2026US 12,746,527 B2Metalmark Innovations, PBC
- High-performance fabric for water/diesel separating filters22 Sep 2026US 12,741,236 B2Saati S.P.A.
- Polyethersulfone fiber webs22 Sep 2026US 12,741,243 B2Hollingsworth & Vose Company
- Multifunctional filter materials8 Oct 2026US 2026/0305741 A1Khalifa University of Science and Technology
- Method for preparing a composite filter medium and the composite filter medium obtained with this method1 Oct 2026US 2026/0295484 A1Saati S.P.A.
- Surface-catalytically finished polymer fibres and/or polymeric sheets, method for surface-catalytically finishing same, and use thereof for producing an air purification filter3 Sep 2026US 2026/0257204 A1Hochschule Niederrhein
- Filtration media and filters27 Aug 2026US 2026/0249218 A1DelStar Technologies, Inc.
- Communicating filter plants27 Aug 2026US 2026/0249226 A1Kappa Filter Systems GmbH
Most cited
By later US patents
- Melt-blown fibrous web1,019US 5,582,907 APall Corporation · 1996
- Web of blended microfibers and crimped bulking fibers445US 4,118,531 AMinnesota Mining and Manufacturing Company · 1978
- Melt-blown fibrous electrets387US 4,215,682 AMinnesota Mining and Manufacturing Company · 1980
- 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