F24D 17/0078
Recirculation systems
Official title: {Recirculation systems}
F24D17/0078 (Recirculation systems) appears on 232 US grants and 248 published applications in this corpus.
Search patents in F24D- Granted patents
- 232
- Published applications
- 248
- Assignees
- 112
- Inventors
- 399
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 2 |
| 2003 | 1 | 2 |
| 2004 | 1 | 2 |
| 2005 | 2 | 6 |
| 2006 | 4 | 6 |
| 2007 | 2 | 1 |
| 2008 | 1 | 8 |
| 2009 | 1 | 12 |
| 2010 | 6 | 15 |
| 2011 | 3 | 9 |
| 2012 | 7 | 11 |
| 2013 | 7 | 15 |
| 2014 | 3 | 8 |
| 2015 | 12 | 6 |
| 2016 | 9 | 14 |
| 2017 | 8 | 9 |
| 2018 | 11 | 19 |
| 2019 | 10 | 11 |
| 2020 | 13 | 24 |
| 2021 | 20 | 16 |
| 2022 | 20 | 13 |
| 2023 | 16 | 17 |
| 2024 | 12 | 10 |
| 2025 | 9 | 9 |
| 2026 | 6 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Storage water heater equipped with at least one auxiliary heater and a circulator29 Sep 2026US 12,747,869 B2
- Method for operating a temperature-controlled circulation system and temperature-controlled circulation system8 Sep 2026US 12,729,518 B2Ltz—Zentrum FüR Luft—Und Trinkwasserhygiene GmbH
- Circulation pump, system and method for domestic hot-water recirculation14 Jul 2026US 12,680,280 B2Grundfos Holding A/S
- Hot water circulation device and hot water device monitoring system23 Jun 2026US 12,663,166 B2Noritz Corporation
- Method for operating a circulation system, and circulation system19 May 2026US 12,631,010 B2Ltz—Zentrum FüR Luft—Und Trinkwasserhygiene GmbH
- System and method of a kosher water heating device27 Aug 2026US 2026/0251354 A1
- Methods of operating a water heater appliance25 Jun 2026US 2026/0177286 A1Haier US Appliance Solutions, Inc.
- Systems and methods for circulating water30 Apr 2026US 2026/0117990 A1Coflex S.A. de C.V.
- Recirculation valve30 Oct 2025US 2025/0334197 A1Kyungdong Navien Co., Ltd.
- Recirculation system using wireless power2 Oct 2025US 2025/0305684 A1Rheem Manufacturing Company
Most cited
By later US patents
- Fluid and gas supply system317US 6,286,764 B12001
- Water heater controller140US 5,056,712 A1991
- Recirculation hot water system96US 5,205,318 ASjoberg Industries, Inc. · 1993
- Residential hot water circulation system and associated method82US 5,829,467 A1998
- Watersaving recirculating system77US 5,261,443 A1993