F24D 3/02
Hot-water central heating systems: with forced circulation
Official title: with forced circulation, e.g. by pumps
F24D3/02 (Hot-water central heating systems: with forced circulation) appears on 114 US grants and 158 published applications in this corpus.
Search patents in F24D- Granted patents
- 114
- Published applications
- 158
- Assignees
- 81
- Inventors
- 296
- Latest grant
- 24 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 2 |
| 2008 | 1 | 2 |
| 2009 | 0 | 1 |
| 2010 | 1 | 4 |
| 2011 | 0 | 6 |
| 2012 | 2 | 3 |
| 2013 | 1 | 8 |
| 2014 | 1 | 2 |
| 2015 | 5 | 5 |
| 2016 | 3 | 13 |
| 2017 | 8 | 17 |
| 2018 | 7 | 26 |
| 2019 | 12 | 5 |
| 2020 | 13 | 14 |
| 2021 | 11 | 13 |
| 2022 | 5 | 4 |
| 2023 | 5 | 3 |
| 2024 | 8 | 9 |
| 2025 | 4 | 10 |
| 2026 | 2 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Air conditioning system using heat pump and air heating device24 Feb 2026US 12,560,338 B2Kyungdong Navien Co., Ltd.
- Heating body20 Jan 2026US 12,529,523 B2
- Heating system26 Aug 2025US 12,398,922 B2Intellihot, Inc.
- Cold and hot water supply and power generation system including graphene-coated ceramic heating element6 May 2025US 12,292,202 B2Graphene Technolege Co., Ltd
- Heat transfer systems and methods of using the same15 Apr 2025US 12,276,425 B2
- Heat pump device10 Sep 2026US 2026/0266475 A1Fujitsu General Limited
- System and method for controlling a dual-fuel heating system in a virtual power plant during periods of peak demand to reduce consumption on a power grid25 Jun 2026US 2026/0177264 A1Carrier Corporation
- Electric boiler11 Jun 2026US 2026/0160429 A1
- Air conditioning system using heat pump and air heating device4 Jun 2026US 2026/0153244 A1Kyungdong Navien Co., Ltd.
- System and method for hydronic distribution with submersible pumps in an unpressurized tank30 Apr 2026US 2026/0117988 A1Hunt Utilities Group LLC
Most cited
By later US patents
- Water driven generator for sanitary domestic installation56US 4,963,780 AKwc AG · 1990
- Home heating system employing water heater as heating source26US 4,371,111 A1983
- Unit for distribution and/or collection of cold and/or of heat26US 5,743,110 A1998
- Venturi pressurizer for incompressible-liquid circulating systems25US 4,471,907 AAmtrol Inc. · 1984
- Metal building with integrated hot water heating system20US 4,011,989 A1977