F24F 2221/22
Cleaning ducts or apparatus
F24F2221/22 (Cleaning ducts or apparatus) appears on 236 US grants and 250 published applications in this corpus.
Search patents in F24F- Granted patents
- 236
- Published applications
- 250
- Assignees
- 137
- Inventors
- 519
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 8 | 0 |
| 2001 | 6 | 0 |
| 2002 | 6 | 3 |
| 2003 | 7 | 5 |
| 2004 | 6 | 6 |
| 2005 | 4 | 9 |
| 2006 | 4 | 5 |
| 2007 | 1 | 2 |
| 2008 | 1 | 3 |
| 2009 | 0 | 4 |
| 2010 | 3 | 8 |
| 2011 | 1 | 4 |
| 2012 | 1 | 7 |
| 2013 | 3 | 4 |
| 2014 | 3 | 1 |
| 2015 | 2 | 4 |
| 2016 | 10 | 4 |
| 2017 | 5 | 13 |
| 2018 | 7 | 12 |
| 2019 | 12 | 13 |
| 2020 | 13 | 20 |
| 2021 | 15 | 17 |
| 2022 | 17 | 24 |
| 2023 | 14 | 25 |
| 2024 | 21 | 21 |
| 2025 | 25 | 16 |
| 2026 | 17 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Valve assembly for AC condensate line22 Sep 2026US 12,742,568 B2
- Refrigeration cycle device and refrigerant leakage determination system4 Aug 2026US 12,698,914 B2Daikin Industries, Ltd.
- Air conditioner and control method thereof28 Jul 2026US 12,693,031 B2Samsung Electronics Co., Ltd.
- Method of enhancing performance of a porous evaporative media14 Jul 2026US 12,680,054 B2Ecolab USA Inc.
- Methods and apparatus for improved rooftop units for heating ventilation and air conditioning systems9 Jun 2026US 12,650,240 B2Clauger USA, LLC
- Method of enhancing performance of a porous evaporative media8 Oct 2026US 2026/0308483 A1Ecolab USA Inc.
- Modular structural enclosure for a roof top hvac unit17 Sep 2026US 2026/0276239 A1Clauger USA, LLC
- Eductor with integrated orifice check valve and scale control tray27 Aug 2026US 2026/0251324 A1Research Products Corporation
- Liquid water source collection apparatus, air conditioner, control method20 Aug 2026US 2026/0243464 A1Shenzhen Roborock Innovation Technology Co., Ltd.
- Water and air disinfection integrated in a niti based system6 Aug 2026US 2026/0224765 A1Exergyn Ltd.
Most cited
By later US patents
- System and method for cleaning air conditioning drains51US 6,041,611 A2000
- Portable airborne contamination control system including a main and remote unit45US 6,616,720 B12003
- Self-cleaning heat exchanger fan assembly and controls41US 5,226,285 ADanhard, Inc. · 1993
- Self-washing coil for air conditioning units33US 6,318,108 B12001
- Collection pan treatment apparatus33US 6,487,867 B12002