F28D 20/0043
Specially adapted for long-term heat storage
Official title: {specially adapted for long-term heat storage; Underground tanks; Floating reservoirs; Pools; Ponds (F28D20/0052 takes precedence)}
F28D20/0043 (Specially adapted for long-term heat storage) appears on 98 US grants and 72 published applications in this corpus.
Search patents in F28D- Granted patents
- 98
- Published applications
- 72
- Assignees
- 52
- Inventors
- 162
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 6 | 0 |
| 1978 | 6 | 0 |
| 1979 | 6 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 7 | 0 |
| 1983 | 4 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 2 | 4 |
| 2010 | 0 | 0 |
| 2011 | 1 | 3 |
| 2012 | 0 | 2 |
| 2013 | 0 | 2 |
| 2014 | 0 | 3 |
| 2015 | 1 | 8 |
| 2016 | 1 | 3 |
| 2017 | 7 | 4 |
| 2018 | 3 | 6 |
| 2019 | 4 | 5 |
| 2020 | 3 | 3 |
| 2021 | 4 | 4 |
| 2022 | 3 | 8 |
| 2023 | 4 | 4 |
| 2024 | 2 | 5 |
| 2025 | 7 | 2 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Passive management of thermal stratification within long-duration liquid-based thermal energy storage reservoirs16 Jun 2026US 12,656,067 B1Terrafore Technologies, LLC
- System and method for providing domestic hot water and/or space heating within a building, and a removable cover of a storage vessel19 May 2026US 12,631,345 B2Mitsubishi Electric Corporation
- Heating and cooling of buildings using underground heat storage28 Oct 2025US 12,455,120 B1United Services Automobile Association (USAA)
- Heating and cooling of buildings using underground heat storage with horizontal bores23 Sep 2025US 12,422,194 B1United Services Automobile Association (USAA)
- Thermal energy storage systems with improved seismic stability8 Jul 2025US 12,352,505 B2Rondo Energy, Inc.
- Thermal energy storage systems with improved seismic stability12 Mar 2026US 2026/0071829 A1Rondo Energy, Inc.
- Heat and cold storage tank with counterflow heat exchanger5 Mar 2026US 2026/0063375 A1
- Combined ground-based heat exchange and thermal storage15 Jan 2026US 2026/0016236 A1
- Any Depth Ground Thermal Battery8 May 2025US 2025/0146712 A1
- Energy Transfer System with Underground Thermal Storage and Corresponding Method1 May 2025US 2025/0137732 A1
Most cited
By later US patents
- Heat storage vessels for use with heat pumps and solar panels81US 5,941,238 A1999
- Solar energy system and apparatus70US 4,235,221 A1980
- Heat storage tank57US 4,010,731 AHalm Instrument Co., Inc. · 1977
- Solar power generation system54US 7,340,899 B1Solar Energy Production Corporation · 2008
- Solar power station having groups of solar collectors30US 4,350,143 A1982