F01B 29/08
Reciprocating-piston machines or engines not otherwise provided for
F01B29/08 (Reciprocating-piston machines or engines not otherwise provided for) appears on 98 US grants and 63 published applications in this corpus.
Search patents in F01B- Granted patents
- 98
- Published applications
- 63
- Assignees
- 48
- Inventors
- 150
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 6 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 5 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 0 |
| 2003 | 0 | 3 |
| 2004 | 3 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 5 |
| 2007 | 2 | 1 |
| 2008 | 4 | 5 |
| 2009 | 0 | 0 |
| 2010 | 4 | 2 |
| 2011 | 2 | 4 |
| 2012 | 1 | 2 |
| 2013 | 5 | 5 |
| 2014 | 1 | 5 |
| 2015 | 6 | 6 |
| 2016 | 4 | 5 |
| 2017 | 4 | 4 |
| 2018 | 4 | 5 |
| 2019 | 2 | 1 |
| 2020 | 6 | 5 |
| 2021 | 3 | 0 |
| 2022 | 1 | 1 |
| 2023 | 0 | 0 |
| 2024 | 3 | 1 |
| 2025 | 1 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Power system with carbon dioxide working fluid, generator, and propulsion system10 Mar 2026US 12,571,310 B2
- Free-piston Stirling engine7 Oct 2025US 12,435,911 B2Twinbird Corporation
- Power system with carbon dioxide working fluid, generator, and propulsion system17 Sep 2024US 12,091,978 B1
- Pressure control system for a closed-cycle engine3 Sep 2024US 12,078,066 B1Hyliion Holdings Corp.
- Combined circulating system of micro gas turbine, transportation means and charging system2 Jan 2024US 11,859,494 B2Technologies' Xanadu of Resonatory-Solar-Systemed Co., Ltd.
- Reciprocating mechanical devices and methods of operation1 Oct 2026US 2026/0298321 A1
- Power system with carbon dioxide working fluid, generator, and propulsion system28 Aug 2025US 2025/0270931 A1
- Free-piston stirling engine14 Nov 2024US 2024/0376850 A1Twinbird Corporation
- Combined circulating system of micro gas turbine, transportation means and charging system13 Oct 2022US 2022/0325665 A1Technologies' Xanadu of Resonatory-Solar-Systemed Co., Ltd.
- Power generation system and electricity generation system using the power generation system23 Jul 2020US 2020/0232324 A1
Most cited
By later US patents
- Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange119US 8,436,489 B2LightSail Energy, Inc. · 2013
- Piston reciprocating compressed air engine80US 4,651,525 A1987
- Electrochemical prime mover49US 4,402,817 A1983
- Electrochemical prime mover41US 4,522,698 A1985
- Hydraulic external heat source engine36US 4,747,271 AVHF Corporation · 1988