B01D 39/18
The material being cellulose or derivatives thereof
Official title: the material being cellulose or derivatives thereof ({cork or peat B01D39/1646} ; making filter paper D21F11/14)
B01D39/18 (The material being cellulose or derivatives thereof) appears on 586 US grants and 789 published applications in this corpus.
Search patents in B01D- Granted patents
- 586
- Published applications
- 789
- Assignees
- 424
- Inventors
- 1,696
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 4 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 2 | 0 |
| 1981 | 7 | 0 |
| 1982 | 5 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 6 | 0 |
| 1991 | 8 | 0 |
| 1992 | 9 | 0 |
| 1993 | 7 | 0 |
| 1994 | 6 | 0 |
| 1995 | 11 | 0 |
| 1996 | 5 | 0 |
| 1997 | 13 | 0 |
| 1998 | 17 | 0 |
| 1999 | 7 | 0 |
| 2000 | 9 | 0 |
| 2001 | 12 | 6 |
| 2002 | 13 | 9 |
| 2003 | 7 | 26 |
| 2004 | 13 | 23 |
| 2005 | 13 | 21 |
| 2006 | 16 | 29 |
| 2007 | 15 | 19 |
| 2008 | 8 | 16 |
| 2009 | 7 | 16 |
| 2010 | 5 | 21 |
| 2011 | 13 | 17 |
| 2012 | 19 | 21 |
| 2013 | 7 | 22 |
| 2014 | 19 | 20 |
| 2015 | 10 | 26 |
| 2016 | 9 | 40 |
| 2017 | 21 | 26 |
| 2018 | 10 | 35 |
| 2019 | 26 | 37 |
| 2020 | 24 | 40 |
| 2021 | 29 | 68 |
| 2022 | 22 | 72 |
| 2023 | 24 | 52 |
| 2024 | 36 | 52 |
| 2025 | 41 | 54 |
| 2026 | 26 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Control center box and flexible bathtub6 Oct 2026US 12,751,582 B2Jiaxing Virpol Sanitary Ware co., LTD.
- Substrate treatments29 Sep 2026US 12,746,490 B2Donaldson Company, Inc.
- High efficiency synthetic filter media1 Sep 2026US 12,722,107 B2Knowlton Technologies, LLC
- 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
- Honeycomb structure and method for manufacturing same18 Aug 2026US 12,709,829 B2Tohoku University
- Method of filtration of particulated systems with injection of nanobubbles, and, use8 Oct 2026US 2026/0306978 A1Universidade Federal Do Rio Grande Do Sul—Ufrgs
- Filtration media and filters27 Aug 2026US 2026/0249218 A1DelStar Technologies, Inc.
- Filter6 Aug 2026US 2026/0225013 A1Seiko Epson Corporation
- Inorganic fiber sheet23 Jul 2026US 2026/0208083 A1Tomoegawa Co., Ltd.
- Passive sensor capable of detection of materials including specific dna or dna-like strands16 Jul 2026US 2026/0201448 A1Dna Profile Ltd.
Most cited
By later US patents
- Polymer, polymer microfiber, polymer nanofiber and applications including filter structures252US 6,743,273 B2Donaldson Company, Inc. · 2004
- Filtration arrangement and method242US 5,082,476 ADonaldson Company, Inc. · 1992
- Cleanable high efficiency filter media structure and applications for use231US 7,008,465 B2Donaldson Company, Inc. · 2006
- Filtration arrangement221US 5,238,474 ADonaldson Company, Inc. · 1993
- Method and apparatus for the electrostatic charging of a web or film195US 5,401,446 AThe University of Tennessee Research Corporation · 1995