F01B 9/04
Reciprocating-piston machines or engines characterised by connections between pistons and main shafts
Official title: with rotary main shaft other than crankshaft
F01B9/04 (Reciprocating-piston machines or engines characterised by connections between pistons and main shafts) appears on 433 US grants and 287 published applications in this corpus.
Search patents in F01B- Granted patents
- 433
- Published applications
- 287
- Assignees
- 138
- Inventors
- 552
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 7 | 0 |
| 1978 | 6 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 9 | 0 |
| 1982 | 8 | 0 |
| 1983 | 9 | 0 |
| 1984 | 9 | 0 |
| 1985 | 8 | 0 |
| 1986 | 6 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 10 | 0 |
| 1990 | 15 | 0 |
| 1991 | 5 | 0 |
| 1992 | 5 | 0 |
| 1993 | 5 | 0 |
| 1994 | 10 | 0 |
| 1995 | 10 | 0 |
| 1996 | 18 | 0 |
| 1997 | 8 | 0 |
| 1998 | 6 | 0 |
| 1999 | 8 | 0 |
| 2000 | 7 | 0 |
| 2001 | 8 | 3 |
| 2002 | 9 | 5 |
| 2003 | 6 | 4 |
| 2004 | 5 | 12 |
| 2005 | 5 | 7 |
| 2006 | 7 | 9 |
| 2007 | 6 | 14 |
| 2008 | 9 | 10 |
| 2009 | 8 | 20 |
| 2010 | 5 | 19 |
| 2011 | 8 | 18 |
| 2012 | 17 | 17 |
| 2013 | 10 | 13 |
| 2014 | 12 | 14 |
| 2015 | 9 | 14 |
| 2016 | 9 | 15 |
| 2017 | 11 | 10 |
| 2018 | 9 | 6 |
| 2019 | 15 | 18 |
| 2020 | 10 | 15 |
| 2021 | 18 | 19 |
| 2022 | 14 | 9 |
| 2023 | 10 | 5 |
| 2024 | 4 | 3 |
| 2025 | 6 | 6 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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- Electro-fluidic remote drive26 Aug 2025US 12,398,737 B2PHD, Inc.
- Hydrostatic pressure to kinetic energy conversion system27 May 2025US 12,313,028 B2
- Reciprocating pump turning and barring tool27 May 2025US 12,313,064 B2Eku Power Drives Inc.
- Hypocycloidal mechanism6 Aug 2026US 2026/0226966 A1
- Multi-stage system16 Apr 2026US 2026/0103985 A1Kn Gg IP Holding and Licensing, LLC
- Valved-piston and actuator with recycled combustion4 Dec 2025US 2025/0369373 A1
- Electro-fluidic drive system6 Nov 2025US 2025/0341224 A1PHD, Inc.
- A radial cam engine16 Oct 2025US 2025/0320819 A1
Most cited
By later US patents
- Continuously variable transmission106US 8,480,529 B2Fallbrook Intellectual Property Company LLC · 2013
- Continuously variable transmission70US 9,017,207 B2Fallbrook Intellectual Property Company LLC · 2015
- Cam controlled reciprocating piston device54US 4,459,945 A1984
- Internal combustion engine with stroke specialized cylinders47US 5,546,897 A1996
- Engine47US 6,223,703 B12001