F24D
Domestic- or space-heating systems
Official title: DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (using steam or condensate extracted or exhausted from steam engine plants for heating purposes F01K17/02)
F24D (Domestic- or space-heating systems) appears on 5,442 US grants and 5,483 published applications in this corpus.
Search patents in F24D- Granted patents
- 5,442
- Published applications
- 5,483
- Assignees
- 2,431
- Inventors
- 10,188
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 52 | 0 |
| 1977 | 74 | 0 |
| 1978 | 94 | 0 |
| 1979 | 96 | 0 |
| 1980 | 120 | 0 |
| 1981 | 160 | 0 |
| 1982 | 112 | 0 |
| 1983 | 119 | 0 |
| 1984 | 103 | 0 |
| 1985 | 114 | 0 |
| 1986 | 86 | 0 |
| 1987 | 84 | 0 |
| 1988 | 70 | 0 |
| 1989 | 58 | 0 |
| 1990 | 70 | 0 |
| 1991 | 51 | 0 |
| 1992 | 50 | 0 |
| 1993 | 51 | 0 |
| 1994 | 47 | 0 |
| 1995 | 33 | 0 |
| 1996 | 42 | 0 |
| 1997 | 47 | 0 |
| 1998 | 65 | 0 |
| 1999 | 62 | 0 |
| 2000 | 67 | 0 |
| 2001 | 50 | 15 |
| 2002 | 50 | 50 |
| 2003 | 59 | 54 |
| 2004 | 48 | 96 |
| 2005 | 46 | 104 |
| 2006 | 61 | 85 |
| 2007 | 38 | 128 |
| 2008 | 39 | 145 |
| 2009 | 44 | 201 |
| 2010 | 67 | 253 |
| 2011 | 63 | 301 |
| 2012 | 114 | 282 |
| 2013 | 104 | 249 |
| 2014 | 153 | 264 |
| 2015 | 173 | 337 |
| 2016 | 218 | 282 |
| 2017 | 233 | 256 |
| 2018 | 262 | 301 |
| 2019 | 247 | 258 |
| 2020 | 218 | 308 |
| 2021 | 248 | 289 |
| 2022 | 211 | 305 |
| 2023 | 225 | 213 |
| 2024 | 241 | 288 |
| 2025 | 185 | 245 |
| 2026 | 118 | 174 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F24D 19/00Details1,941
- F24D 3/00Hot-water central heating systems1,259
- F24D 17/00Domestic hot-water supply systems1,113
- F24D 2200/00Heat sources or energy sourcesIndexing code1,059
- F24D 11/00Central heating systems using heat accumulated in storage masses999
- F24D 2220/00Components of central heating installations excluding heat sourcesIndexing code683
- F24D 5/00Hot-air central heating systems505
- F24D 13/00Electric heating systems362
All 19 main groupsShow fewer
- F24D 12/00Domestic- or space-heating systems: other central heating systems233
- F24D 18/00Small-scale combined heat and power [chp] generation systems specially adapted for domestic206
- F24D 2101/00Electric generators of small-scale chp systemsIndexing code204
- F24D 15/00Domestic- or space-heating systems: other domestic- or space-heating systems158
- F24D 2103/00Thermal aspects of small-scale chp systemsIndexing code140
- F24D 10/00District heating systems123
- F24D 2240/00Characterizing positionsIndexing code85
- F24D 1/00Steam central heating systems66
- F24D 7/00Central heating systems employing heat-transfer fluids not covered by groups f24d1/00 -37
- F24D 2105/00Constructional aspects of small-scale chp systemsIndexing code32
- F24D 9/00Central heating systems employing combinations of heat transfer fluids covered by two25
Recent patents
- Hot flushing of building water system6 Oct 2026US 12,753,585 B2Magarl, LLC
- Electronic faucet, method of coupling between a source of conditioned water or fluid and a faucet and method for controlling an electronic faucet6 Oct 2026US 12,753,587 B2Gessi S.P.A.
- Auxiliary system for a low-temperature thermal energy distribution network6 Oct 2026US 12,753,933 B2Apterix SA
- Storage water heater equipped with at least one auxiliary heater and a circulator29 Sep 2026US 12,747,869 B2
- Systems and methods for controlling a variable gas valve15 Sep 2026US 12,736,230 B2Copeland Comfort Control LP
- Energy buffering using a heat pump8 Oct 2026US 2026/0309339 A1Mixergy Limited
- Water heating system and device8 Oct 2026US 2026/0309340 A1Mixergy Limited
- Organic-light emitting diode1 Oct 2026US 2026/0298429 A1Pictiva Displays International Limited
- Expansion tank capable of preventing internal leakage1 Oct 2026US 2026/0298482 A1
- Heating installation1 Oct 2026US 2026/0298483 A1Energy Machines ApS
Most cited
By later US patents
- System and method for energy usage curtailment424US 6,868,293 B1Itron, Inc. · 2005
- Fluid and gas supply system317US 6,286,764 B12001
- Remote temperature sensing transmitting and programmable thermostat system240US 6,213,404 B12001
- Sheet heater203US 4,733,057 ARaychem Corporation · 1988
- Pre-programmed electronic programmable thermostat198US 5,329,991 AHunter Fan Company · 1994