F01L 21/00
Use of working pistons or pistons-rods as fluid-distributing valves or as valve-supporting
Official title: Use of working pistons or pistons-rods as fluid-distributing valves or as valve-supporting elements, e.g. in free-piston machines
F01L21/00 (Use of working pistons or pistons-rods as fluid-distributing valves or as valve-supporting) appears on 102 US grants and 40 published applications in this corpus.
Search patents in F01L- Granted patents
- 102
- Published applications
- 40
- Assignees
- 52
- Inventors
- 125
- Latest grant
- 4 Jul 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 11 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 3 |
| 2004 | 0 | 1 |
| 2005 | 3 | 2 |
| 2006 | 0 | 2 |
| 2007 | 1 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 2 |
| 2012 | 1 | 2 |
| 2013 | 0 | 0 |
| 2014 | 5 | 4 |
| 2015 | 4 | 2 |
| 2016 | 1 | 1 |
| 2017 | 0 | 5 |
| 2018 | 5 | 1 |
| 2019 | 4 | 3 |
| 2020 | 2 | 4 |
| 2021 | 4 | 3 |
| 2022 | 2 | 1 |
| 2023 | 2 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Linear combustion engines with valve in piston4 Jul 2023US 11,692,478 B2Intelline Inc.
- Single air supply using hollow piston rod23 May 2023US 11,655,756 B2Aquarius Engines (A.M.) Ltd.
- Piston rod and free piston engine31 May 2022US 11,346,279 B2Aquarius Engines (A.M.) Ltd.
- Internal combustion engine22 Mar 2022US 11,280,293 B2Coutts Industries Inc.
- Overspeed protection system and method6 Jul 2021US 11,053,861 B2General Electric Company
- Linear combustion engines with valve in piston23 Feb 2023US 2023/0058375 A1Intelline Inc.
- Single air supply using hollow piston rod18 Aug 2022US 2022/0260011 A1Aquarius Engines (A.M.) Ltd.
- Internal Combustion Engine18 Nov 2021US 2021/0355892 A1Coutts Industries Inc.
- Piston rod and free piston engine24 Jun 2021US 2021/0189954 A1Aquarius Engines (A.M.) Ltd.
- Internal Combustion Engine25 Mar 2021US 2021/0087996 A1Coutts Industries Inc.
Most cited
By later US patents