F25B 2500/31
Low ambient temperatures
F25B2500/31 (Low ambient temperatures) appears on 217 US grants and 229 published applications in this corpus.
Search patents in F25B- Granted patents
- 217
- Published applications
- 229
- Assignees
- 104
- Inventors
- 557
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 4 | 1 |
| 2003 | 0 | 3 |
| 2004 | 2 | 5 |
| 2005 | 4 | 6 |
| 2006 | 4 | 4 |
| 2007 | 2 | 3 |
| 2008 | 3 | 7 |
| 2009 | 4 | 5 |
| 2010 | 2 | 4 |
| 2011 | 1 | 7 |
| 2012 | 2 | 9 |
| 2013 | 1 | 7 |
| 2014 | 3 | 4 |
| 2015 | 7 | 14 |
| 2016 | 7 | 11 |
| 2017 | 8 | 22 |
| 2018 | 17 | 17 |
| 2019 | 14 | 13 |
| 2020 | 20 | 14 |
| 2021 | 10 | 18 |
| 2022 | 21 | 16 |
| 2023 | 17 | 18 |
| 2024 | 14 | 5 |
| 2025 | 8 | 11 |
| 2026 | 3 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Flash tank overflow warning system14 Jul 2026US 12,680,744 B2Rheem Manufacturing Company
- Free cooling operation of a chiller3 Feb 2026US 12,540,765 B2Tyco Fire & Security GmbH
- System and method for controlling head pressure in a refrigeration system13 Jan 2026US 12,523,405 B2Lennox Industries Inc.
- Control method and control device for electronic expansion valve and air source heat pump system30 Dec 2025US 12,510,277 B2Guangdong Carrier Hvac Co., Ltd.
- Heat pump14 Oct 2025US 12,442,572 B2Yanmar Power Technology Co., Ltd.
- System and Method for Controlling Head Pressure in a Refrigeration System16 Jul 2026US 2026/0202111 A1Lennox Industries Inc.
- Method and system for controlling a condensing unit4 Jun 2026US 2026/0153277 A1KE2 Therm Solutions, Inc.
- Cooling system with dual refrigerant condensing zones7 May 2026US 2026/0126226 A1Vertiv Corporation
- Air conditioning apparatus5 Feb 2026US 2026/0036347 A1Mitsubishi Electric Corporation
- Cooling system with enhanced low ambient application for low boiling refrigerant29 Jan 2026US 2026/0029150 A1Vertiv Corporation
Most cited
By later US patents
- Refrigeration system subcooling control76US 4,136,528 AMcQuay-Perfex Inc. · 1979
- Refrigeration system energy controller72US 4,602,484 A1986
- Reversible cycle heating and cooling system60US 4,493,193 A1985
- Refrigerator50US 6,497,113 B1Matsushita Refrigeration Company · 2002
- Multifluid heat pump system46US 4,796,437 A1989