B01D 2275/307
Porosity increasing in flow direction
B01D2275/307 (Porosity increasing in flow direction) appears on 15 US grants and 12 published applications in this corpus.
Search patents in B01D- Granted patents
- 15
- Published applications
- 12
- Assignees
- 19
- Inventors
- 62
- Latest grant
- 29 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 2 |
| 2017 | 0 | 1 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 2 |
| 2022 | 0 | 2 |
| 2023 | 0 | 0 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Collection apparatus for collecting particulate matter generated in brake system of transport facility29 Apr 2025US 12,287,017 B2Korea Institute of Ceramic Engineering and Technology
- Filter holding device, developing device, process cartridge, image forming apparatus, and filter23 Jan 2024US 11,880,160 B2Ricoh Company, Ltd.
- Bag filters having controlled air permeability and dust collectors using the same28 Jan 2020US 10,543,444 B2Korea Institute of Energy Research
- Air/oil separator17 May 2005US 6,893,478 B2ROLLS-ROYCE plc
- Filter of high accuracy15 Jun 2004US 6,749,753 B1Chisso Corporation
- Collection apparatus for collecting particulate matter generated in brake system of transport facility30 Jun 2022US 2022/0205499 A1Korea Institute of Ceramic Engineering and Technology
- Filter holding device, developing device, process cartridge, image forming apparatus, and filter7 Apr 2022US 2022/0107605 A1Ricoh Company, Ltd.
- Filter assembly22 Apr 2021US 2021/0113951 A1Arun Co., Ltd.
- Filter media having an optimized gradient8 Apr 2021US 2021/0101100 A1Hollingsworth & Vose Company
- Brake Dust Particle Filter and Disc Brake Assembly Comprising a Brake Dust Particle Filter3 Sep 2020US 2020/0278002 A1Mann+Hummel GmbH
Most cited
By later US patents
- Air induction filter assembly92US 6,464,761 B1Visteon Global Technologies, Inc. · 2002
- Liquid-gas separator87US 4,878,929 ANelson Industries, Inc. · 1989
- Air/oil separator31US 6,893,478 B2ROLLS-ROYCE plc · 2005
- Filter for an air-conditioning or heating system for a motor vehicle27US 5,338,253 ABehr GmbH & Co. · 1994
- Air filter and method of construction24US 5,437,701 AS.T. Technologies, Inc. · 1995