F03G 4/026
Open loop geothermal collectors
Official title: {open loop geothermal collectors}
F03G4/026 (Open loop geothermal collectors) appears on 235 US grants and 125 published applications in this corpus.
Search patents in F03G- Granted patents
- 235
- Published applications
- 125
- Assignees
- 111
- Inventors
- 292
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 11 | 0 |
| 1978 | 8 | 0 |
| 1979 | 6 | 0 |
| 1980 | 10 | 0 |
| 1981 | 7 | 0 |
| 1982 | 11 | 0 |
| 1983 | 7 | 0 |
| 1984 | 7 | 0 |
| 1985 | 6 | 0 |
| 1986 | 3 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 7 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 6 | 0 |
| 1996 | 5 | 0 |
| 1997 | 10 | 0 |
| 1998 | 5 | 0 |
| 1999 | 7 | 0 |
| 2000 | 4 | 0 |
| 2001 | 10 | 3 |
| 2002 | 0 | 1 |
| 2003 | 2 | 1 |
| 2004 | 0 | 1 |
| 2005 | 2 | 1 |
| 2006 | 0 | 2 |
| 2007 | 1 | 3 |
| 2008 | 2 | 1 |
| 2009 | 0 | 2 |
| 2010 | 3 | 9 |
| 2011 | 0 | 7 |
| 2012 | 1 | 7 |
| 2013 | 2 | 11 |
| 2014 | 10 | 13 |
| 2015 | 5 | 6 |
| 2016 | 7 | 3 |
| 2017 | 9 | 1 |
| 2018 | 4 | 3 |
| 2019 | 0 | 2 |
| 2020 | 0 | 2 |
| 2021 | 4 | 4 |
| 2022 | 1 | 6 |
| 2023 | 7 | 7 |
| 2024 | 5 | 10 |
| 2025 | 9 | 10 |
| 2026 | 5 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods, systems, and computer-readable media for use in harvesting heat from subterranean geologic formations4 Aug 2026US 12,698,762 B1Maza Aa Energy, Inc.
- Geothermal power generation systems with pressure exchangers12 May 2026US 12,624,681 B2Energy Recovery, Inc.
- Thermal energy storage system for use with a low temperature heat source and a thermal power cycle system21 Apr 2026US 12,607,170 B2Rondo Energy, Inc.
- Direct air capture using geothermal cooling towers14 Apr 2026US 12,601,327 B2Fervo Energy Company
- System and method for harvesting geothermal energy from a subterranean formation7 Apr 2026US 12,595,936 B2Colorado School of Mines
- Pressure and temperature recovery systems for geothermal power plants24 Sep 2026US 2026/0286940 A1Sage Geosystems Inc.
- Pondless hydromechanical storage system24 Sep 2026US 2026/0286941 A1Sage Geosystems Inc.
- Geothermal power systems and processes20 Aug 2026US 2026/0243234 A1Sage Geosystems Inc.
- Device for exchanging geothermal energy with an aquifer which is near the surface, and thermal power station comprising at least one such device20 Aug 2026US 2026/0243235 A1Usc-Consulting GmbH
- System and method for coupling geothermal energy storage with coalbed methane extraction in unmineable coalbed6 Aug 2026US 2026/0226814 A1China University of Geosciences (Wuhan)
Most cited
By later US patents
- Method and apparatus for converting heat from geothermal liquid and geothermal steam to electric power142US 5,440,882 AExergy S.P.A. · 1995
- Method and apparatus for cooling hot fluids112US 5,860,279 A1999
- Process for heating a fluid in a geothermal formation110US 4,060,988 ATexaco Inc. · 1977
- Method of and apparatus for producing power using steam107US 5,497,624 AOrmat, Inc. · 1996
- Method of developing and producing deep geothermal reservoirs104US 7,753,122 B2Terrawatt Holdings Corporation · 2010