A47L 9/18
Liquid filters
A47L9/18 (Liquid filters) appears on 143 US grants and 125 published applications in this corpus.
Search patents in A47L- Granted patents
- 143
- Published applications
- 125
- Assignees
- 64
- Inventors
- 215
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 8 | 0 |
| 2000 | 3 | 0 |
| 2001 | 7 | 5 |
| 2002 | 5 | 4 |
| 2003 | 3 | 1 |
| 2004 | 2 | 4 |
| 2005 | 3 | 10 |
| 2006 | 1 | 4 |
| 2007 | 8 | 2 |
| 2008 | 1 | 3 |
| 2009 | 0 | 3 |
| 2010 | 3 | 5 |
| 2011 | 2 | 2 |
| 2012 | 4 | 14 |
| 2013 | 1 | 0 |
| 2014 | 6 | 5 |
| 2015 | 4 | 4 |
| 2016 | 3 | 3 |
| 2017 | 5 | 1 |
| 2018 | 3 | 3 |
| 2019 | 3 | 22 |
| 2020 | 10 | 2 |
| 2021 | 2 | 3 |
| 2022 | 5 | 5 |
| 2023 | 5 | 8 |
| 2024 | 2 | 3 |
| 2025 | 2 | 5 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Surface cleaning apparatus8 Sep 2026US 12,727,731 B2Omachron Intellectual Property Inc.
- Cleaning device and use7 Apr 2026US 12,593,949 B2ReBerni Limited
- Pet cleaning and treatment apparatus and method6 Jan 2026US 12,514,225 B2
- Anti-bacterial cleaning machine with wet filter14 Oct 2025US 12,440,077 B2T.P.A. Impex S.p.A.
- Surface cleaning apparatus25 Mar 2025US 12,256,877 B2Omachron Intellectual Property Inc.
- Surface cleaning apparatus24 Sep 2026US 2026/0283435 A1Omachron Intellectual Property Inc.
- Surface cleaning apparatus25 Jun 2026US 2026/0174304 A1Omachron Intellectual Property Inc.
- Surface cleaning apparatus25 Jun 2026US 2026/0174305 A1Omachron Intellectual Property Inc.
- Rotating baffle for use in a vacuum cleaner26 Feb 2026US 2026/0053317 A1Origyn LLC
- Surface cleaning apparatus30 Oct 2025US 2025/0331696 A1Omachron Intellectual Property Inc.
Most cited
By later US patents
- Clean air vacuum cleaners98US 5,481,780 A1996
- Universal vacuum cleaner85US 5,815,881 A1998
- Ultra-filtration vacuum system72US 5,922,093 AMiracle Marketing Corporation · 1999
- Vacuum cleaner having a liquid medium filter63US 5,205,014 A1993
- Vacuum cleaner with two stage filtration63US 8,117,713 B2BISSELL Homecare, Inc. · 2012