F25B 2500/24
Low amount of refrigerant in the system
F25B2500/24 (Low amount of refrigerant in the system) appears on 123 US grants and 138 published applications in this corpus.
Search patents in F25B- Granted patents
- 123
- Published applications
- 138
- Assignees
- 67
- Inventors
- 333
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 2 |
| 2003 | 0 | 3 |
| 2004 | 3 | 4 |
| 2005 | 5 | 3 |
| 2006 | 3 | 4 |
| 2007 | 0 | 0 |
| 2008 | 3 | 1 |
| 2009 | 1 | 4 |
| 2010 | 2 | 0 |
| 2011 | 1 | 1 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 4 |
| 2015 | 3 | 8 |
| 2016 | 4 | 7 |
| 2017 | 7 | 8 |
| 2018 | 9 | 18 |
| 2019 | 14 | 7 |
| 2020 | 11 | 9 |
| 2021 | 7 | 7 |
| 2022 | 6 | 12 |
| 2023 | 9 | 14 |
| 2024 | 8 | 13 |
| 2025 | 14 | 7 |
| 2026 | 5 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Adjustable working fluid reservoir for HVAC system6 Oct 2026US 12,753,942 B2Tyco Fire & Security GmbH
- Cooling circuit for a system for supplying and cooling a gas6 Oct 2026US 12,753,961 B2Gaztransport Et Technigaz
- Air conditioner and control method thereof28 Apr 2026US 12,613,058 B2Qingdao Hisense Hitachi Air-Conditioning Systems Co., Ltd.
- Air conditioner and air conditioning system24 Feb 2026US 12,560,364 B2Fujitsu General Limited
- Method of evaluating refrigerant charge within a refrigeration circuit10 Feb 2026US 12,546,520 B2Carrier Corporation
- Server device, refrigeration cycle system, and management method9 Jul 2026US 2026/0194276 A1Daikin Industries, Ltd.
- Air conditioner and method for controlling the same25 Dec 2025US 2025/0389444 A1Samsung Electronics Co., Ltd.
- Intelligent charge compensation in a heat pump system5 Jun 2025US 2025/0180262 A1Allied Air Enterprises LLC
- Heat source unit and refrigeration apparatus22 May 2025US 2025/0164168 A1Daikin Industries, Ltd.
- Cooling circuit for a system for supplying and cooling a gas13 Feb 2025US 2025/0052463 A1Gaztransport Et Technigaz
Most cited
By later US patents
- Air conditioning system for automotive vehicles99US 4,677,830 ADiesel Kiki Co., Ltd. · 1987
- Low refrigerant charge detection system92US 5,457,965 AFord Motor Company · 1995
- Cost-effective remote monitoring, diagnostic and system health prediction system and method for vapor compression and heat pump units based on compressor discharge line temperature sampling54US 9,168,315 B1Mainstream Engineering Corporation · 2015
- Multi-type air conditioner system with optimum control for gaseous flow adjustment valve and liquid expansion valve35US 5,263,333 AKabushiki Kaisha Toshiba · 1993
- Refrigerating cycle apparatus28US 5,910,159 ADenso Corporation · 1999