F03G 4/02
Devices for producing mechanical power from geothermal energy: with direct working fluid
Official title: with direct {working} fluid contact
F03G4/02 (Devices for producing mechanical power from geothermal energy: with direct working fluid) appears on 81 US grants and 85 published applications in this corpus.
Search patents in F03G- Granted patents
- 81
- Published applications
- 85
- Assignees
- 55
- Inventors
- 146
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 2 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 1 | 2 |
| 2010 | 0 | 1 |
| 2011 | 1 | 2 |
| 2012 | 1 | 4 |
| 2013 | 2 | 2 |
| 2014 | 2 | 0 |
| 2015 | 7 | 6 |
| 2016 | 0 | 0 |
| 2017 | 2 | 5 |
| 2018 | 2 | 1 |
| 2019 | 1 | 3 |
| 2020 | 1 | 2 |
| 2021 | 1 | 4 |
| 2022 | 2 | 2 |
| 2023 | 4 | 10 |
| 2024 | 12 | 14 |
| 2025 | 13 | 12 |
| 2026 | 9 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Assembly for generating electricity in a production well of a hot fluid6 Oct 2026US 12,753,677 B2Affin AS
- Apparatus and methods for producing electricity using geothermal energy11 Aug 2026US 12,704,114 B2Geogen Technologies Inc.
- Systems for generating energy from geothermal sources and methods of operating and constructing same30 Jun 2026US 12,669,113 B2Roda Energy Corporation
- Thermal energy storage system coupled with thermal power cycle systems2 Jun 2026US 12,644,396 B2Rondo Energy, Inc.
- Geothermal power generation systems with pressure exchangers12 May 2026US 12,624,681 B2Energy Recovery, Inc.
- Pondless hydromechanical storage system24 Sep 2026US 2026/0286941 A1Sage Geosystems Inc.
- Geothermal power generation systems with pressure exchangers17 Sep 2026US 2026/0275967 A1Energy Recovery, Inc.
- Systems for Generating Energy from Geothermal Sources and Methods of Operating and Constructing Same10 Sep 2026US 2026/0266266 A1Roda Energy Corporation
- A geothermal hydrogen production and compression system20 Aug 2026US 2026/0242246 A1Good Water Energy Ltd.
- Geothermal power systems and processes20 Aug 2026US 2026/0243234 A1Sage Geosystems Inc.
Most cited
By later US patents
- Method and apparatus for steam generation from isothermal geothermal reservoirs106US 6,073,448 A2000
- Geothermal heat recovery from high-temperature, low-permeability geologic formations for power generation using closed loop systems83US 10,527,026 B2GreenFire Energy Inc. · 2020
- Geothermal heat mining and utilization75US 5,515,679 A1996
- Closed loop energy production from geothermal reservoirs71US 8,708,046 B2ConocoPhillips Company · 2014
- Method and apparatus for using geothermal energy for the production of power59US 7,320,221 B2Oramt Technologies Inc. · 2008