F03G 4/031
Devices for producing mechanical power from geothermal energy: using waste heat from
Official title: {using waste heat from a primary power cycle to produce mechanical power in a second cycle}
F03G4/031 (Devices for producing mechanical power from geothermal energy: using waste heat from) appears on 21 US grants and 25 published applications in this corpus.
Search patents in F03G- Granted patents
- 21
- Published applications
- 25
- Assignees
- 14
- Inventors
- 33
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
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| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
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| 2008 | 1 | 0 |
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| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 0 | 3 |
| 2015 | 1 | 1 |
| 2016 | 2 | 0 |
| 2017 | 2 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 1 | 1 |
| 2021 | 2 | 4 |
| 2022 | 3 | 3 |
| 2023 | 4 | 2 |
| 2024 | 1 | 3 |
| 2025 | 2 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for harvesting geothermal energy from a subterranean formation7 Apr 2026US 12,595,936 B2Colorado School of Mines
- Thermal processes and systems for generating electricity utilizing predetermined working fluids4 Nov 2025US 12,460,556 B2
- Thermal processes and systems for generating electricity utilizing predetermined working fluids30 Sep 2025US 12,428,971 B2
- System and method for harvesting geothermal energy from a subterranean formation16 Apr 2024US 11,959,666 B2Colorado School of Mines
- Heat exchange circuit for a geothermal plant31 Oct 2023US 11,802,716 B2TURBODEN S. p. A.
- System and method for harvesting geothermal energy from a subterranean formation9 Jul 2026US 2026/0194263 A1Colorado School of Mines
- Thermal processes and systems for generating electricity utilizing predetermined working fluids7 Nov 2024US 2024/0368996 A1
- Thermal processes and systems for generating electricity utilizing predetermined working fluids7 Nov 2024US 2024/0369263 A1
- System and method for harvesting geothermal energy from a subterranean formation1 Aug 2024US 2024/0255189 A1Colorado School of Mines
- Modular sustainable power plant for harvesting non-volcanic geothermal heat13 Apr 2023US 2023/0111831 A1
Most cited
By later US patents
- Method and apparatus for using geothermal energy for the production of power59US 7,320,221 B2Oramt Technologies Inc. · 2008
- Closed loop energy production from producing geothermal wells41US 11,255,576 B2GreenFire Energy Inc. · 2022
- High efficiency binary geothermal system40US 11,365,652 B2TURBODEN S. p. A. · 2022
- Method of optimizing performance of Rankine cycle power plants23US 4,358,930 AThe United States of America as represented by the United States Department of Energy · 1982
- System and method for harvesting geothermal energy from a subterranean formation8US 11,959,666 B2Colorado School of Mines · 2024