F01B 7/20
Machines or engines with two or more pistons reciprocating within same cylinder
Official title: with two or more pistons reciprocating one within another, e.g. one piston forming cylinder of the other
F01B7/20 (Machines or engines with two or more pistons reciprocating within same cylinder) appears on 43 US grants and 28 published applications in this corpus.
Search patents in F01B- Granted patents
- 43
- Published applications
- 28
- Assignees
- 14
- Inventors
- 34
- Latest grant
- 28 May 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 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 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 1 |
| 2011 | 1 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 5 | 11 |
| 2018 | 5 | 3 |
| 2019 | 3 | 0 |
| 2020 | 0 | 5 |
| 2021 | 2 | 1 |
| 2022 | 3 | 1 |
| 2023 | 1 | 0 |
| 2024 | 1 | 1 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Piston in piston variable displacement hydraulic device28 May 2024US 11,994,121 B1Tonand Inc.
- Engine with gas exchange through piston rod27 Jun 2023US 11,686,199 B2Aquarius Engines (A.M.) Ltd.
- Engine with at least one of non-sinusoidal motion and embedded pistons12 Jul 2022US 11,384,639 B2University of Ontario Institute of Technology
- Engine with work stroke and gas exchange through piston rod31 May 2022US 11,346,219 B2Aquarius Engines (A.M.) Ltd.
- Two stroke engine with valves actuated by air pressure near bottom dead center22 Mar 2022US 11,280,254 B2
- Piston in piston variable displacement hydraulic device30 Jul 2026US 2026/0218690 A1
- Piston in piston variable displacement hydraulic device12 Dec 2024US 2024/0410345 A1
- Engine with gas exchange through piston rod8 Sep 2022US 2022/0282620 A1Aquarius Engines (A.M.) Ltd.
- A two stroke engine with valves actuated by air pressure near bottom dead center23 Sep 2021US 2021/0293177 A1
- Engine with at least one of non-sinusoidal motion and embedded pistons17 Sep 2020US 2020/0291778 A1University of Ontario Institute of Technology
Most cited
By later US patents
- High efficiency multicycle internal combustion engine with waste heat recovery41US 8,061,140 B2Thermal Power Recovery LLC · 2011
- Double-yoke balanced compressor17US 4,248,050 AThe United States of America as represented by the Secretary of the Army · 1981
- Hermetic refrigeration rotary motor-compressor17US 4,431,356 A1984
- Low-impact air cylinder16US 5,191,825 ADoben Limited · 1993
- Hermetic refrigeration rotary motor-compressor12US 4,431,387 A1984