F25B 2313/021
Indoor unit or outdoor unit with auxiliary heat exchanger not forming part
Official title: Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit
F25B2313/021 (Indoor unit or outdoor unit with auxiliary heat exchanger not forming part) appears on 148 US grants and 163 published applications in this corpus.
Search patents in F25B- Granted patents
- 148
- Published applications
- 163
- Assignees
- 70
- Inventors
- 357
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 4 |
| 2003 | 3 | 5 |
| 2004 | 3 | 3 |
| 2005 | 4 | 4 |
| 2006 | 0 | 5 |
| 2007 | 6 | 5 |
| 2008 | 5 | 1 |
| 2009 | 2 | 3 |
| 2010 | 3 | 3 |
| 2011 | 0 | 6 |
| 2012 | 1 | 4 |
| 2013 | 0 | 14 |
| 2014 | 4 | 7 |
| 2015 | 4 | 9 |
| 2016 | 11 | 6 |
| 2017 | 7 | 8 |
| 2018 | 7 | 5 |
| 2019 | 10 | 13 |
| 2020 | 12 | 10 |
| 2021 | 9 | 11 |
| 2022 | 10 | 9 |
| 2023 | 5 | 9 |
| 2024 | 11 | 11 |
| 2025 | 8 | 3 |
| 2026 | 5 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F25B 2313/0212The auxiliary heat exchanger being only used during dehumidifyingIndexing code20
- F25B 2313/0213The auxiliary heat exchanger being only used during heatingIndexing code20
- F25B 2313/0211The auxiliary heat exchanger being only used during defrostingIndexing code14
- F25B 2313/0215The auxiliary heat exchanger being used parallel to the outdoor heat exchangerIndexing code9
- F25B 2313/0214The auxiliary heat exchanger being used parallel to the indoor unit duringIndexing code8
Recent patents
- Variable refrigerant flow system and control method18 Aug 2026US 12,710,207 B2Guangdong Carrier Hvac Co., Ltd.
- Heat pump system and control method thereof12 May 2026US 12,624,874 B2Carrier Corporation
- Method and device for controlling air conditioner24 Mar 2026US 12,584,665 B2Gd Midea Heating & Ventilating Equipment Co., Ltd.
- Integrated demand water heating using a capacity modulated heat pump with desuperheater17 Mar 2026US 12,578,124 B2WaterFurnace International, Inc.
- Air-conditioning apparatus and air-conditioning system20 Jan 2026US 12,529,499 B2Mitsubishi Electric Corporation
- Refrigeration cycle device, and refrigeration cycle device control method23 Jul 2026US 2026/0210602 A1Fujitsu General Limited
- Air conditioner23 Jul 2026US 2026/0210611 A1Daikin Industries, Ltd.
- Integrated demand water heating using a capacity modulated heat pump with desuperheater25 Jun 2026US 2026/0177290 A1WaterFurnace International, Inc.
- Multi-split central air conditioning system for simultaneous cooling and heating30 Apr 2026US 2026/0118009 A1Jingkelun Refrigeration Equipment Co., Ltd.
- Noise Management System for Thermal Energy Storage Equipped Heat Pump Systems23 Apr 2026US 2026/0110474 A1Robert Bosch GmbH
Most cited
By later US patents
- Three function heat pump system77US 4,693,089 APhenix Heat Pump Systems, Inc. · 1987
- Dual source heat pump67US 4,336,692 AAtlantic Richfield Company · 1982
- Integrated system for heating, cooling and heat recovery ventilation61US 6,347,527 B12002
- Geothermal subcircuit for air conditioning unit54US 5,937,665 AGeofurnace Systems, Inc. · 1999
- Integrated heat pump water heater46US 4,598,557 ASouthern Company Services, Inc. · 1986