F24D 3/00
Hot-water central heating systems
Official title: Hot-water central heating systems (district heating systems F24D10/00; central heating systems using heat accumulated in storage masses F24D11/00)
F24D3/00 (Hot-water central heating systems) appears on 1,259 US grants and 1,477 published applications in this corpus.
Search patents in F24D- Granted patents
- 1,259
- Published applications
- 1,477
- Assignees
- 721
- Inventors
- 2,555
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 20 | 0 |
| 1978 | 9 | 0 |
| 1979 | 13 | 0 |
| 1980 | 12 | 0 |
| 1981 | 24 | 0 |
| 1982 | 13 | 0 |
| 1983 | 13 | 0 |
| 1984 | 13 | 0 |
| 1985 | 9 | 0 |
| 1986 | 19 | 0 |
| 1987 | 21 | 0 |
| 1988 | 18 | 0 |
| 1989 | 14 | 0 |
| 1990 | 9 | 0 |
| 1991 | 14 | 0 |
| 1992 | 8 | 0 |
| 1993 | 8 | 0 |
| 1994 | 10 | 0 |
| 1995 | 8 | 0 |
| 1996 | 9 | 0 |
| 1997 | 14 | 0 |
| 1998 | 20 | 0 |
| 1999 | 19 | 0 |
| 2000 | 22 | 0 |
| 2001 | 18 | 4 |
| 2002 | 14 | 13 |
| 2003 | 17 | 18 |
| 2004 | 15 | 30 |
| 2005 | 10 | 30 |
| 2006 | 22 | 26 |
| 2007 | 14 | 49 |
| 2008 | 11 | 41 |
| 2009 | 7 | 51 |
| 2010 | 21 | 67 |
| 2011 | 15 | 78 |
| 2012 | 22 | 59 |
| 2013 | 30 | 57 |
| 2014 | 34 | 64 |
| 2015 | 36 | 88 |
| 2016 | 55 | 75 |
| 2017 | 60 | 84 |
| 2018 | 68 | 96 |
| 2019 | 65 | 51 |
| 2020 | 64 | 92 |
| 2021 | 78 | 77 |
| 2022 | 38 | 64 |
| 2023 | 68 | 62 |
| 2024 | 56 | 81 |
| 2025 | 38 | 78 |
| 2026 | 29 | 42 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F24D 3/12Tube and panel arrangements for ceiling, wall, or underfloor heating453
- F24D 3/10Feed-line arrangements303
- F24D 3/08In combination with systems for domestic hot-water supply263
- F24D 3/18Hot-water central heating systems: using heat pumps222
- F24D 3/02Hot-water central heating systems: with forced circulation114
- F24D 3/005Combined with solar energy39
- F24D 3/04Hot-water central heating systems: with the water under high pressure11
Recent patents
- Integrated heating system using a Stirling heat pump18 Aug 2026US 12,710,202 B2Trane International Inc.
- Prefabricated construction wall assembly16 Jun 2026US 12,655,630 B2Wall to Wall, LLC
- Profiled section for temperature-control of a room, and building element assembly comprising said profiled section9 Jun 2026US 12,650,015 B2
- 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.
- Energy buffering using a heat pump8 Oct 2026US 2026/0309339 A1Mixergy Limited
- Water heating system and device8 Oct 2026US 2026/0309340 A1Mixergy Limited
- Expansion tank capable of preventing internal leakage1 Oct 2026US 2026/0298482 A1
- Heating installation1 Oct 2026US 2026/0298483 A1Energy Machines ApS
- Heating Circuit and Degassing Device17 Sep 2026US 2026/0276214 A1Viessmann Holding International GmbH
Most cited
By later US patents
- Pipe retaining clip and method for installing radiant heat flooring174US 5,598,682 AHaughian Sales Ltd. · 1997
- System for modular building construction152US 7,827,738 B22010
- Utilities container82US 6,393,775 B12002
- Plumbing and heating pipe system for water supply purposes, made either completely or mainly of plastic material, especially of polypropylene81US 5,286,001 AKarl Rafeld KG Spritzgusswerk, Elektronik und Formenbau · 1994
- Three function heat pump system77US 4,693,089 APhenix Heat Pump Systems, Inc. · 1987