F25D 21/12
By hot-fluid circulating system separate from the refrigerant system
Official title: by hot-fluid circulating system separate from the refrigerant system
F25D21/12 (By hot-fluid circulating system separate from the refrigerant system) appears on 209 US grants and 158 published applications in this corpus.
Search patents in F25D- Granted patents
- 209
- Published applications
- 158
- Assignees
- 95
- Inventors
- 367
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 8 | 0 |
| 1981 | 14 | 0 |
| 1982 | 17 | 0 |
| 1983 | 10 | 0 |
| 1984 | 7 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 4 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 6 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 2 |
| 2003 | 3 | 4 |
| 2004 | 1 | 0 |
| 2005 | 3 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 3 |
| 2008 | 0 | 1 |
| 2009 | 0 | 3 |
| 2010 | 3 | 1 |
| 2011 | 0 | 6 |
| 2012 | 0 | 5 |
| 2013 | 3 | 5 |
| 2014 | 2 | 9 |
| 2015 | 5 | 8 |
| 2016 | 5 | 13 |
| 2017 | 9 | 13 |
| 2018 | 9 | 17 |
| 2019 | 12 | 12 |
| 2020 | 14 | 12 |
| 2021 | 7 | 7 |
| 2022 | 15 | 15 |
| 2023 | 7 | 10 |
| 2024 | 7 | 5 |
| 2025 | 9 | 1 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Heat pump system8 Sep 2026US 12,729,890 B2Samsung Electronics Co., Ltd.
- Refrigeration door system and door assembly with defrosting and related methods8 Sep 2026US 12,729,900 B2
- Heat pump system and components thereof12 May 2026US 12,624,872 B2Terravis Energy, Inc.
- Heat pump23 Sep 2025US 12,422,170 B2LG Electronics Inc.
- Double skin heat exchanger apparatus and system22 Jul 2025US 12,366,390 B2The Coca-Cola Company
- Heat pump system and components thereof20 Aug 2026US 2026/0243481 A1Terravis Energy, Inc.
- Heat pump system and components thereof9 Apr 2026US 2026/0098669 A1Terravis Energy, Inc.
- Defrosting system and method for freezer12 Mar 2026US 2026/0071806 A1Bynasci Technology Co., LTD
- Systems and methods for defrosting an outdoor heat exchanger of a heat pump26 Feb 2026US 2026/0055951 A1Trane International Inc.
- Refrigerator and control method thereof15 Jan 2026US 2026/0016215 A1Samsung Electronics Co., Ltd.
Most cited
By later US patents
- Fluid defrost system and method for secondary refrigeration systems78US 5,921,092 AHussmann Corporation · 1999
- Dual source heat pump67US 4,336,692 AAtlantic Richfield Company · 1982
- Control system for an aircraft galley cooler66US 6,845,627 B1BE Intellectual Property, Inc. · 2005
- Low temperature display merchandiser57US 5,357,767 AHussmann Corporation · 1994
- Refrigeration system using liquid-to-liquid heat transfer for warm liquid defrost51US 6,170,270 B2Delaware Capital Formation, Inc. · 2001