B01D 2275/302
Means for changing the porosity of a filter element
Official title: Means for changing the porosity of a filter element, e.g. adjustment of a slit width, compression of a foam material
B01D2275/302 (Means for changing the porosity of a filter element) appears on 13 US grants and 13 published applications in this corpus.
Search patents in B01D- Granted patents
- 13
- Published applications
- 13
- Assignees
- 10
- Inventors
- 25
- Latest grant
- 23 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 2 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 2 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 1 |
| 2019 | 0 | 0 |
| 2020 | 2 | 2 |
| 2021 | 0 | 1 |
| 2022 | 2 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 2 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
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- System and method for context aware networked mask with dynamic air impedance for optimum breathability28 Jul 2022US 2022/0233896 A1Tata Consultancy Services Limited
- Tortuous path filter for airbag inflator18 Mar 2021US 2021/0078523 A1Autoliv ASP, Inc.
- Gasoline particulate filters with high initial filtering efficiency and methods of making same26 Nov 2020US 2020/0370452 A1Afton Chemical Corporation
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Most cited
By later US patents
- Filter having a change indicator131US 6,110,260 A3M Innovative Properties Company · 2000
- Fluid filter separator and method3US 8,147,590 B22012
- Apparatus for generating hydrocarbon fuel2US 8,262,753 B22012
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- Gasoline particulate filters with high initial filtering efficiency and methods of making same1US 10,774,708 B2Afton Chemical Corporation · 2020