F01L 21/02
Piston or piston-rod used as valve members
Official title: Piston or piston-rod used as valve members {(F01L25/066 takes precedence)}
F01L21/02 (Piston or piston-rod used as valve members) appears on 39 US grants and 14 published applications in this corpus.
Search patents in F01L- Granted patents
- 39
- Published applications
- 14
- Assignees
- 23
- Inventors
- 50
- Latest grant
- 4 Jul 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 5 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 2 |
| 2015 | 1 | 0 |
| 2016 | 1 | 1 |
| 2017 | 0 | 3 |
| 2018 | 3 | 1 |
| 2019 | 2 | 2 |
| 2020 | 1 | 1 |
| 2021 | 2 | 0 |
| 2022 | 0 | 0 |
| 2023 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Linear combustion engines with valve in piston4 Jul 2023US 11,692,478 B2Intelline Inc.
- Overspeed protection system and method6 Jul 2021US 11,053,861 B2General Electric Company
- Engine with work stroke and gas exchange through piston rod18 May 2021US 11,008,864 B2Aquarius Engines (A.M.) Ltd.
- Systems and methods of compression ignition engines2 Jun 2020US 10,669,926 B2Nautilus Engineering, LLC
- High efficiency steam engine and impact-free piston operated valves therefor30 Apr 2019US 10,273,840 B1Thermal Power Recovery LLC
- Linear combustion engines with valve in piston23 Feb 2023US 2023/0058375 A1Intelline Inc.
- Engine with work stroke and gas exchange through piston rod20 Feb 2020US 2020/0056480 A1Aquarius Engines (A.M.) Ltd.
- High efficiency steam engine and impact-free piston operated valves therefor2 May 2019US 2019/0128152 A1Thermal Power Recovery LLC
- Systems and methods of compression ignition engines14 Mar 2019US 2019/0078499 A1Nautilus Engineering, LLC
- Two-stroke internal combustion engine10 May 2018US 2018/0128132 A1
Most cited
By later US patents