A47L 9/20
Means for cleaning filters
A47L9/20 (Means for cleaning filters) appears on 354 US grants and 464 published applications in this corpus.
Search patents in A47L- Granted patents
- 354
- Published applications
- 464
- Assignees
- 147
- Inventors
- 748
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 6 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 2 |
| 2002 | 3 | 3 |
| 2003 | 3 | 7 |
| 2004 | 4 | 10 |
| 2005 | 4 | 14 |
| 2006 | 7 | 8 |
| 2007 | 9 | 23 |
| 2008 | 11 | 21 |
| 2009 | 5 | 22 |
| 2010 | 12 | 17 |
| 2011 | 17 | 8 |
| 2012 | 7 | 12 |
| 2013 | 15 | 15 |
| 2014 | 13 | 15 |
| 2015 | 12 | 13 |
| 2016 | 13 | 13 |
| 2017 | 12 | 18 |
| 2018 | 11 | 20 |
| 2019 | 17 | 14 |
| 2020 | 12 | 38 |
| 2021 | 14 | 24 |
| 2022 | 27 | 31 |
| 2023 | 31 | 30 |
| 2024 | 12 | 26 |
| 2025 | 22 | 31 |
| 2026 | 9 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Valve arrangement for an industrial dust extractor2 Jun 2026US 12,642,404 B2Husqvarna AB
- Crematory vacuum cleaner19 May 2026US 12,631,328 B2
- Vacuum cleaner and docking station for use with the same12 May 2026US 12,622,561 B2SharkNinja Operating LLC
- Arrangement of a de-dusting unit in a vacuuming device and vacuuming device with such an arrangement28 Apr 2026US 12,611,080 B2Hilti Aktiengesellschaft
- Self-cleaning vacuum cleaner24 Mar 2026US 12,582,274 B2Dyson Technology Limited
- Suction device and method for its operation24 Sep 2026US 2026/0283424 A1Hilti Aktiengesellschaft
- Negative pressure structure of dust suction device24 Sep 2026US 2026/0283425 A1Cinderson Technology (Suzhou) Co., Ltd.
- Separator for a fluid cleaning device24 Sep 2026US 2026/0284678 A1Dyson Technology Limited
- Cleaning device10 Sep 2026US 2026/0262891 A1Guangdong Deerma Technology Co., Ltd.
- Vacuum cleaner27 Aug 2026US 2026/0248334 A1
Most cited
By later US patents
- Cyclonic vacuum cleaner220US 6,625,845 B2Sharp Kabushiki Kaisha · 2003
- Carpet cleaning machine for particulate removal219US 5,307,538 ARacine Industries, Inc. · 1994
- Carpet cleaning machine with convertible-use feature218US 5,287,591 ARacine Industries, Inc. · 1994
- Hand-holdable vacuum cleaners203US 7,370,387 B2Black & Decker Inc. · 2008
- Hand-guided sweeping machine156US 4,974,283 AHako-Werke GmbH · 1990