B01D 46/44
Controlling filtration
Official title: controlling filtration
B01D46/44 (Controlling filtration) appears on 1,168 US grants and 1,324 published applications in this corpus.
Search patents in B01D- Granted patents
- 1,168
- Published applications
- 1,324
- Assignees
- 741
- Inventors
- 3,139
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 6 | 0 |
| 1981 | 6 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 7 | 0 |
| 1985 | 8 | 0 |
| 1986 | 8 | 0 |
| 1987 | 4 | 0 |
| 1988 | 11 | 0 |
| 1989 | 10 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 5 | 0 |
| 1993 | 8 | 0 |
| 1994 | 15 | 0 |
| 1995 | 13 | 0 |
| 1996 | 13 | 0 |
| 1997 | 13 | 0 |
| 1998 | 16 | 0 |
| 1999 | 12 | 0 |
| 2000 | 22 | 0 |
| 2001 | 18 | 6 |
| 2002 | 15 | 8 |
| 2003 | 19 | 25 |
| 2004 | 21 | 34 |
| 2005 | 20 | 25 |
| 2006 | 15 | 25 |
| 2007 | 18 | 39 |
| 2008 | 14 | 28 |
| 2009 | 24 | 38 |
| 2010 | 14 | 33 |
| 2011 | 20 | 35 |
| 2012 | 26 | 15 |
| 2013 | 23 | 27 |
| 2014 | 22 | 27 |
| 2015 | 25 | 36 |
| 2016 | 26 | 43 |
| 2017 | 33 | 78 |
| 2018 | 43 | 56 |
| 2019 | 44 | 69 |
| 2020 | 64 | 103 |
| 2021 | 68 | 139 |
| 2022 | 87 | 133 |
| 2023 | 81 | 100 |
| 2024 | 85 | 80 |
| 2025 | 83 | 63 |
| 2026 | 55 | 59 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Air filtration apparatus and system for providing patient information6 Oct 2026US 12,752,071 B2ResMed Pty Ltd
- Haircare appliance29 Sep 2026US 12,746,492 B2Dyson Technology Limited
- Vehicle, fleet, and method for treating environment air15 Sep 2026US 12,734,886 B2MANN+HUMMEL Ventures Pte. Ltd.
- Air purifier15 Sep 2026US 12,736,443 B2Samsung Electronics Co., Ltd.
- Control of evacuation stations8 Sep 2026US 12,727,729 B2iRobot Corporation
- Stackable air treatment device8 Oct 2026US 2026/0306982 A1Carrier Corporation
- Air filtration assembly with airflow feedback1 Oct 2026US 2026/0295492 A1Apex Brands, Inc.
- Air filtration system with main and subsidiary assemblies1 Oct 2026US 2026/0295493 A1Apex Brands, Inc.
- Air filtration assembly with air quality control24 Sep 2026US 2026/0284564 A1Apex Brands, Inc.
- Active precleaner system and methods of use24 Sep 2026US 2026/0284565 A1Donaldson Company, Inc.
Most cited
By later US patents
- Air filtration system with filter efficiency management373US 6,391,102 B1Stackhouse, Inc. · 2002
- Dual mode laser smoke evacuation system with sequential filter monitor and vacuum compensation360US 5,242,474 ASorenson Laboratories, Inc. · 1993
- Air cleaner having sealing arrangement between media arrangement and housing342US 6,179,890 B2Donaldson Company, Inc. · 2001
- Medical/surgical waste collection unit including waste containers of different storage volumes with inter-container transfer valve and independently controlled vacuum levels332US 7,621,898 B2Stryker Corporation · 2009
- Device and method for monitoring the integrity of filtering installations289US 7,048,775 B2Sartorius AG · 2006