F24D 3/18
Hot-water central heating systems: using heat pumps
Official title: using heat pumps
F24D3/18 (Hot-water central heating systems: using heat pumps) appears on 222 US grants and 331 published applications in this corpus.
Search patents in F24D- Granted patents
- 222
- Published applications
- 331
- Assignees
- 145
- Inventors
- 620
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 2 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 0 | 5 |
| 2010 | 2 | 13 |
| 2011 | 2 | 25 |
| 2012 | 2 | 15 |
| 2013 | 1 | 12 |
| 2014 | 8 | 16 |
| 2015 | 10 | 18 |
| 2016 | 14 | 16 |
| 2017 | 9 | 10 |
| 2018 | 14 | 20 |
| 2019 | 10 | 14 |
| 2020 | 18 | 21 |
| 2021 | 23 | 17 |
| 2022 | 8 | 17 |
| 2023 | 22 | 23 |
| 2024 | 16 | 28 |
| 2025 | 15 | 35 |
| 2026 | 10 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Integrated heating system using a Stirling heat pump18 Aug 2026US 12,710,202 B2Trane International Inc.
- Heating systems9 Jun 2026US 12,650,244 B2Mixergy Limited
- Capping apparatus and method for in-ground heat exchangers2 Jun 2026US 12,644,627 B2Innovia Geo Corp.
- System and method for providing domestic hot water and/or space heating within a building, and a removable cover of a storage vessel19 May 2026US 12,631,345 B2Mitsubishi Electric Corporation
- Methods and systems for modulating energy usage12 May 2026US 12,624,861 B2Octopus Energy Heating Limited
- Energy buffering using a heat pump8 Oct 2026US 2026/0309339 A1Mixergy Limited
- Heating installation1 Oct 2026US 2026/0298483 A1Energy Machines ApS
- Cluster Water Source Heat Pump17 Sep 2026US 2026/0276221 A1
- Heat pump device10 Sep 2026US 2026/0266475 A1Fujitsu General Limited
- Method for controlling a supply fluid temperature of a heat pump of a floor heating system27 Aug 2026US 2026/0251319 A1
Most cited
By later US patents
- Three function heat pump system77US 4,693,089 APhenix Heat Pump Systems, Inc. · 1987
- Method of controlling a heat pump, and a heat pump device adapted to operate in accordance with said method59US 4,165,619 AMessler, Societe Anonyme · 1979
- Integrated space heating, air conditioning and potable water heating appliance43US 4,798,240 AGas Research Institute · 1989
- Closed loop ground source pressurized system for a heat pump41US 5,244,037 A1993
- Heat pump system38US 3,984,050 AProjectus Industriprodukter AB · 1976