F24F 11/41
Defrosting
Official title: Defrosting; Preventing freezing
F24F11/41 (Defrosting) appears on 432 US grants and 465 published applications in this corpus.
Search patents in F24F- Granted patents
- 432
- Published applications
- 465
- Assignees
- 168
- Inventors
- 1,133
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 6 | 0 |
| 1992 | 1 | 0 |
| 1993 | 6 | 0 |
| 1994 | 8 | 0 |
| 1995 | 10 | 0 |
| 1996 | 8 | 0 |
| 1997 | 7 | 0 |
| 1998 | 9 | 0 |
| 1999 | 6 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 3 |
| 2002 | 3 | 4 |
| 2003 | 3 | 2 |
| 2004 | 2 | 6 |
| 2005 | 2 | 2 |
| 2006 | 4 | 6 |
| 2007 | 3 | 4 |
| 2008 | 1 | 12 |
| 2009 | 0 | 4 |
| 2010 | 7 | 14 |
| 2011 | 2 | 14 |
| 2012 | 5 | 13 |
| 2013 | 13 | 8 |
| 2014 | 7 | 20 |
| 2015 | 7 | 23 |
| 2016 | 13 | 23 |
| 2017 | 22 | 25 |
| 2018 | 21 | 29 |
| 2019 | 31 | 24 |
| 2020 | 28 | 29 |
| 2021 | 23 | 32 |
| 2022 | 29 | 42 |
| 2023 | 19 | 35 |
| 2024 | 40 | 40 |
| 2025 | 29 | 28 |
| 2026 | 12 | 23 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Operation control system, operation control apparatus, and operation control method25 Aug 2026US 12,716,601 B2Daikin Industries, Ltd.
- Heat exchanger support device25 Aug 2026US 12,716,613 B2Mitsubishi Electric Corporation
- System and method for removing condensation from air conditioning units14 Jul 2026US 12,680,710 B2Rheem Manufacturing Company
- Systems and methods for defrost of heat pump systems30 Jun 2026US 12,669,273 B2Goodman Manufacturing Company, L. P.
- Air conditioner21 Apr 2026US 12,607,367 B2LG Electronics Inc.
- Air conditioning appliances defrost8 Oct 2026US 2026/0309351 A1Haier US Appliance Solutions, Inc.
- Defrost control and management for heat pump applications17 Sep 2026US 2026/0276231 A1Daikin Comfort Technologies Manufacturing, L.P.
- Ventilation unit for a building27 Aug 2026US 2026/0251339 A1Clairitech Innovations Inc.
- Multi-circuit heat pump systems with improved defrost and hot gas reheat modes20 Aug 2026US 2026/0243456 A1Daikin Comfort Technologies Manufacturing, L.P.
- Modular antifreeze valve13 Aug 2026US 2026/0235222 A1Caleffi S.p.A.
Most cited
By later US patents
- Control system and methods for a multiparameter electronically commutated motor250US 5,592,058 AGeneral Electric Company · 1997
- Programmable thermostatic control device190US 4,386,649 ANuclear Systems, Inc. · 1983
- Heat pump motor optimization and sensor fault detection164US 5,630,325 ACopeland Corporation · 1997
- Heat pump motor optimization and sensor fault detection156US 5,440,895 ACopeland Corporation · 1995
- Interactive control system for an HVAC system137US 7,296,426 B2Emerson Electric Co. · 2007