B01D 2201/309
Housings with transparent parts
B01D2201/309 (Housings with transparent parts) appears on 86 US grants and 66 published applications in this corpus.
Search patents in B01D- Granted patents
- 86
- Published applications
- 66
- Assignees
- 55
- Inventors
- 170
- Latest grant
- 2 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 11 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 2 |
| 2003 | 2 | 2 |
| 2004 | 1 | 3 |
| 2005 | 1 | 1 |
| 2006 | 2 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 2 |
| 2009 | 3 | 4 |
| 2010 | 1 | 0 |
| 2011 | 0 | 2 |
| 2012 | 1 | 2 |
| 2013 | 1 | 3 |
| 2014 | 0 | 6 |
| 2015 | 5 | 0 |
| 2016 | 2 | 1 |
| 2017 | 2 | 2 |
| 2018 | 0 | 3 |
| 2019 | 2 | 8 |
| 2020 | 4 | 4 |
| 2021 | 9 | 7 |
| 2022 | 2 | 7 |
| 2023 | 6 | 4 |
| 2024 | 4 | 0 |
| 2025 | 4 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Star pleating with inside out flow having water drainage through the center2 Sep 2025US 12,403,415 B2Parker-Hannifin Corporation
- Filter device8 Jul 2025US 12,350,607 B2Rt-Filtertechnik GmbH
- Fuel-water separator systems and methods1 Apr 2025US 12,263,426 B2Cummins Filtration IP, Inc.
- Device and method for measuring a filter cake thickness18 Feb 2025US 12,228,391 B2BHS-Sonthofen GmbH
- Filter device22 Oct 2024US 12,121,832 B2Rt-Filtertechnik GmbH
- Replaceable filter element18 Sep 2025US 2025/0288926 A1Rt-Filtertechnik GmbH
- Swimming Pool Backwash Filtration Device16 Nov 2023US 2023/0364536 A1
- Oil filter housing and system5 Oct 2023US 2023/0313715 A1Kohler Co.
- Fuel-water separator systems and methods13 Jul 2023US 2023/0219023 A1Cummins Filtration IP, Inc.
- Sand Filter LED Status Light23 Mar 2023US 2023/0090606 A1Evoqua Water Technologies LLC
Most cited
By later US patents
- Fluid filter assembly130US 5,556,542 AFleetguard, Inc. · 1996
- Plastic filter92US 5,171,430 AFleetguard, Inc. · 1992
- Disposable filter unit70US 5,096,575 ASchleicher & Schuell, Inc. · 1992
- Fuel filter assembly51US 5,507,942 ADavco Manufacturing Corporation · 1996
- Water treatment apparatus46US 4,271,015 A1981