F25B 2400/19
Pumping down refrigerant from one part of the cycle to another part
Official title: Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
F25B2400/19 (Pumping down refrigerant from one part of the cycle to another part) appears on 178 US grants and 199 published applications in this corpus.
Search patents in F25B- Granted patents
- 178
- Published applications
- 199
- Assignees
- 81
- Inventors
- 470
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 1 |
| 2003 | 4 | 3 |
| 2004 | 1 | 7 |
| 2005 | 3 | 8 |
| 2006 | 4 | 6 |
| 2007 | 5 | 1 |
| 2008 | 1 | 5 |
| 2009 | 5 | 7 |
| 2010 | 3 | 11 |
| 2011 | 4 | 6 |
| 2012 | 4 | 3 |
| 2013 | 3 | 4 |
| 2014 | 2 | 3 |
| 2015 | 3 | 5 |
| 2016 | 5 | 3 |
| 2017 | 6 | 7 |
| 2018 | 2 | 9 |
| 2019 | 7 | 12 |
| 2020 | 15 | 27 |
| 2021 | 15 | 16 |
| 2022 | 19 | 22 |
| 2023 | 14 | 8 |
| 2024 | 15 | 11 |
| 2025 | 9 | 8 |
| 2026 | 5 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Refrigeration systems with a first compressor system and a second compressor system7 Jul 2026US 12,674,608 B2Hill Phoenix, Inc.
- Test chamber and method26 May 2026US 12,638,377 B2Weiss Technik GmbH
- Refrigeration device21 Apr 2026US 12,607,387 B2Panasonic Intellectual Property Management Co., Ltd.
- Heat pump having a charge management receiver24 Feb 2026US 12,560,363 B2Trane International Inc.
- Heat pump system and controller for controlling operation of the same27 Jan 2026US 12,535,250 B2Daikin Europe N.V.
- System and Method for Evacuating a Refrigerant Leak in an HVAC System30 Jul 2026US 2026/0218958 A1Lennox Industries Inc.
- Refrigeration cycle apparatus23 Jul 2026US 2026/0210610 A1Daikin Industries, Ltd.
- Method and system for controlling a condensing unit4 Jun 2026US 2026/0153277 A1KE2 Therm Solutions, Inc.
- Refrigeration cycle apparatus and control method thereof2 Apr 2026US 2026/0092730 A1Daikin Industries, Ltd.
- Refrigerant evacuation and charge adjustment mechanism26 Mar 2026US 2026/0085864 A1VERTIV INTERNATIONAL GmbH
Most cited
By later US patents
- Dual pump down cycle for protecting a compressor in a refrigeration system63US 4,549,404 ACarrier Corporation · 1985
- Refrigeration system63US 5,802,860 ATyler Refrigeration Corporation · 1998
- Ground source heat pump system62US 5,651,265 A1997
- Geothermal heat exchanger and heat pump circuit59US 5,706,888 AGeofurnace Systems, Inc. · 1998
- Heat pump refrigeration circuit with liquid heating capability51US 4,528,822 AAmerican Standard Inc. · 1985