F24H 15/136
Defrosting or de-icing
Official title: Defrosting or de-icing; Preventing freezing
F24H15/136 (Defrosting or de-icing) appears on 63 US grants and 104 published applications in this corpus.
Search patents in F24H- Granted patents
- 63
- Published applications
- 104
- Assignees
- 54
- Inventors
- 199
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 1 |
| 2003 | 2 | 2 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 3 |
| 2007 | 0 | 0 |
| 2008 | 1 | 3 |
| 2009 | 1 | 2 |
| 2010 | 1 | 9 |
| 2011 | 1 | 4 |
| 2012 | 4 | 5 |
| 2013 | 0 | 4 |
| 2014 | 1 | 2 |
| 2015 | 3 | 3 |
| 2016 | 5 | 2 |
| 2017 | 4 | 3 |
| 2018 | 1 | 3 |
| 2019 | 4 | 1 |
| 2020 | 3 | 3 |
| 2021 | 1 | 11 |
| 2022 | 4 | 4 |
| 2023 | 6 | 4 |
| 2024 | 3 | 7 |
| 2025 | 4 | 15 |
| 2026 | 3 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Cold climate heat pump system with energy storage11 Aug 2026US 12,704,328 B2Trane International Inc.
- Obstruction detection for a heat pump water heater system16 Jun 2026US 12,656,035 B2Bradford White Corporation
- Method of defrosting a heat pump device as well as a heat pump device13 Jan 2026US 12,523,412 B2Stiebel Eltron GmbH & Co. KG
- Water heater controller and methods for controlling water temperature2 Dec 2025US 12,487,009 B2
- Defrost systems and methods for heat pump water heaters4 Nov 2025US 12,460,849 B2Rheem Manufacturing Company
- Water heating system and device8 Oct 2026US 2026/0309340 A1Mixergy Limited
- Hot water heating device3 Sep 2026US 2026/0258973 A1Fujitsu General Limited
- Heat pump-type hot-water heating device6 Aug 2026US 2026/0227097 A1Fujitsu General Limited
- Water heater appliance freeze prevention in recreational vehicles9 Jul 2026US 2026/0194259 A1Haier US Appliance Solutions, Inc.
- Water heater appliance freeze prevention in recreational vehicles9 Jul 2026US 2026/0194260 A1Haier US Appliance Solutions, Inc.
Most cited
By later US patents
- Automatic water heating system82US 6,351,603 B2Arwa Technologies, Inc. · 2002
- Heat pump control system78US 4,627,483 AVisual Information Institute, Inc. · 1986
- Microprocessor control for a heat pump water heater70US 6,212,894 B1WaterFurnace International, Inc. · 2001
- Dual source heat pump67US 4,336,692 AAtlantic Richfield Company · 1982
- Heat pump control system with defrost cycle monitoring60US 4,627,484 AVisual Information Institute, Inc. · 1986