F02G 2244/54
Having two-cylinder twin systems, with compression in one cylinder and expansion in
Official title: having two-cylinder twin systems, with compression in one cylinder and expansion in the other cylinder for each of the twin systems, e.g. "Finkelstein" engines
F02G2244/54 (Having two-cylinder twin systems, with compression in one cylinder and expansion in) appears on 29 US grants and 34 published applications in this corpus.
Search patents in F02G- Granted patents
- 29
- Published applications
- 34
- Assignees
- 11
- Inventors
- 46
- Latest grant
- 7 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 2 |
| 2015 | 0 | 3 |
| 2016 | 0 | 0 |
| 2017 | 6 | 1 |
| 2018 | 1 | 3 |
| 2019 | 0 | 0 |
| 2020 | 2 | 8 |
| 2021 | 5 | 2 |
| 2022 | 2 | 3 |
| 2023 | 3 | 2 |
| 2024 | 3 | 2 |
| 2025 | 1 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Stirling engine with at least four piston assemblies7 Oct 2025US 12,435,681 B2Regensys Ltd
- Engine apparatus and method for operation29 Oct 2024US 12,129,812 B2Hyliion Holdings Corp.
- Constant density heat exchanger and system for energy conversion7 May 2024US 11,976,610 B2Hyliion Holdings Corp.
- Monolithic heat-exchanger bodies30 Jan 2024US 11,885,279 B2Hyliion Holdings Corp.
- Energy conversion apparatus29 Aug 2023US 11,739,711 B2Hyliion Holdings Corp.
- Manifold assembly for a closed-cycle engine13 Aug 2026US 2026/0235090 A1Hyliion Holdings Corp.
- An alpha type stirling engine6 Feb 2025US 2025/0043746 A1EnergyIntel Services Ltd.
- Heat energy conversion device15 Aug 2024US 2024/0271588 A1Regensys Ltd
- Monolithic heat-exchanger bodies16 May 2024US 2024/0159201 A1Hyliion Holdings Corp.
- Constant density heat exchanger and system for energy conversion20 Jul 2023US 2023/0228229 A1General Electric Company
Most cited
By later US patents
- Method and device for balanced compounding of Stirling cycle machines50US 4,199,945 A1980
- Double-acting modular free-piston stirling machines without buffer spaces23US 9,689,344 B12017
- Externally heated engine14US 7,076,941 B1Renewable Thermodynamics, LLC · 2006
- Two-cycle hot-gas engine10US 6,968,688 B2Enerlyt Potsdam GmbH · 2005
- Stirling engine6US 4,760,698 AComitato Nazionale per la Ricerca e per lo Sviluppo del' Energia Nuclere e Delle Energie Alternative · 1988