F24S 20/61
Passive solar heat collectors
Official title: Passive solar heat collectors, e.g. operated without external energy source
F24S20/61 (Passive solar heat collectors) appears on 103 US grants and 89 published applications in this corpus.
Search patents in F24S- Granted patents
- 103
- Published applications
- 89
- Assignees
- 53
- Inventors
- 194
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 3 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 2 |
| 2002 | 1 | 1 |
| 2003 | 0 | 2 |
| 2004 | 1 | 2 |
| 2005 | 2 | 4 |
| 2006 | 1 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 3 |
| 2010 | 0 | 2 |
| 2011 | 1 | 5 |
| 2012 | 2 | 5 |
| 2013 | 2 | 10 |
| 2014 | 5 | 8 |
| 2015 | 5 | 11 |
| 2016 | 4 | 7 |
| 2017 | 7 | 4 |
| 2018 | 7 | 4 |
| 2019 | 4 | 0 |
| 2020 | 1 | 3 |
| 2021 | 1 | 4 |
| 2022 | 4 | 5 |
| 2023 | 5 | 2 |
| 2024 | 4 | 4 |
| 2025 | 1 | 1 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electromagnetic radiation collecting and directing device25 Aug 2026US 12,716,561 B2
- Building with heliodynamic architecture28 Apr 2026US 12,612,777 B2Alcer
- System for moderating energy absorption at the earth's surface with a programmable forcing network of climate control panels4 Mar 2025US 12,239,053 B2
- Heat supply system coupling passive phase change energy storage sunlight room and air source heat pump29 Oct 2024US 12,130,022 B2Tianjin University
- Unpowered anti-frost anti-heave heat gathering device and subgrade thereof15 Oct 2024US 12,116,737 B2Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences
- Solar energy collecting blind arrangement21 Aug 2025US 2025/0263975 A1
- Building with heliodynamic architecture21 Nov 2024US 2024/0384523 A1Alcer
- Electromagnetic radiation collecting and directing device15 Aug 2024US 2024/0271768 A1
- Heat supply system coupling passive phase change energy storage sunlight room and air source heat pump8 Aug 2024US 2024/0263806 A1Tianjin University
- System for moderating energy absorption at the earth's surface with a programmable forcing network of climate control panels25 Jul 2024US 2024/0247838 A1
Most cited
By later US patents
- Phase change thermal insulation structure125US 5,770,295 AEnergy Pillow, Inc. · 1998
- Phase change insulation system97US 5,626,936 AEnergy Pillow, Inc. · 1997
- Modular passive solar energy heating unit employing phase change heat storage material which is clearly transparent when in its high-stored-energy liquid state54US 4,532,917 A1985
- Self-regulating solar window device47US 4,279,240 A1981
- Daylight collection and distribution system43US 5,467,564 AAndersen Corporation · 1995