F25D 21/002
Defroster control
Official title: {Defroster control}
F25D21/002 (Defroster control) appears on 586 US grants and 482 published applications in this corpus.
Search patents in F25D- Granted patents
- 586
- Published applications
- 482
- Assignees
- 226
- Inventors
- 1,307
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 4 | 0 |
| 1978 | 12 | 0 |
| 1979 | 11 | 0 |
| 1980 | 8 | 0 |
| 1981 | 10 | 0 |
| 1982 | 10 | 0 |
| 1983 | 10 | 0 |
| 1984 | 4 | 0 |
| 1985 | 11 | 0 |
| 1986 | 6 | 0 |
| 1987 | 10 | 0 |
| 1988 | 6 | 0 |
| 1989 | 10 | 0 |
| 1990 | 12 | 0 |
| 1991 | 8 | 0 |
| 1992 | 3 | 0 |
| 1993 | 7 | 0 |
| 1994 | 8 | 0 |
| 1995 | 10 | 0 |
| 1996 | 12 | 0 |
| 1997 | 5 | 0 |
| 1998 | 10 | 0 |
| 1999 | 10 | 0 |
| 2000 | 13 | 0 |
| 2001 | 9 | 3 |
| 2002 | 9 | 7 |
| 2003 | 13 | 10 |
| 2004 | 11 | 5 |
| 2005 | 5 | 7 |
| 2006 | 4 | 9 |
| 2007 | 2 | 11 |
| 2008 | 3 | 5 |
| 2009 | 2 | 9 |
| 2010 | 5 | 11 |
| 2011 | 6 | 13 |
| 2012 | 4 | 19 |
| 2013 | 8 | 17 |
| 2014 | 7 | 23 |
| 2015 | 13 | 32 |
| 2016 | 11 | 19 |
| 2017 | 20 | 18 |
| 2018 | 25 | 33 |
| 2019 | 29 | 39 |
| 2020 | 30 | 36 |
| 2021 | 40 | 35 |
| 2022 | 31 | 26 |
| 2023 | 17 | 28 |
| 2024 | 22 | 26 |
| 2025 | 27 | 26 |
| 2026 | 17 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Evaporation tray for refrigerator condensation water15 Sep 2026US 12,736,272 B2I.R.C.A. S.P.A. Industria Resistenze Corazzate E Affini
- Storehouse having a heater for a heat exchanger1 Sep 2026US 12,723,800 B2LG Electronics Inc.
- Method for controlling refrigerator operation and refrigerator25 Aug 2026US 12,716,634 B2Electrolux Do Brasil S/A
- Defrost fan control23 Jun 2026US 12,663,198 B2Trane Technologies Life Sciences LLC
- Refrigerator appliance and method of operating the same during a vacation mode16 Jun 2026US 12,656,053 B2Haier US Appliance Solutions, Inc.
- Method of operating a refrigerator appliance1 Oct 2026US 2026/0298521 A1Haier US Appliance Solutions, Inc.
- Method for defrosting a primary evaporator and an auxiliary evaporator of a refrigerator appliance3 Sep 2026US 2026/0258996 A1
- Refrigerator and server device capable of diagnosing state and methods thereof6 Aug 2026US 2026/0227119 A1Samsung Electronics Co., Ltd.
- Method for operating a heat exchanger and system comprising a heat exchanger9 Jul 2026US 2026/0194316 A1Guntner GmbH & Co. KG
- Method and apparatus for determining freezer status25 Jun 2026US 2026/0177309 A1Elemental Machines, Inc.
Most cited
By later US patents
- Method and device for monitoring the operation of a motor150US 5,512,883 A1996
- Self-calibrating control methods and systems for refrigeration systems109US 4,653,285 AGeneral Electric Company · 1987
- Fuzzy logic based controller for cooling and refrigerating systems108US 5,440,891 A1995
- Demand defrost control method and apparatus98US 4,882,908 ARanco Incorporated · 1989
- Blocked fan detection system for heat pump96US 5,440,890 ACopeland Corporation · 1995