F01L 21/04
Valves arranged in or on piston or piston-rod
F01L21/04 (Valves arranged in or on piston or piston-rod) appears on 54 US grants and 19 published applications in this corpus.
Search patents in F01L- Granted patents
- 54
- Published applications
- 19
- Assignees
- 27
- Inventors
- 75
- Latest grant
- 4 Jul 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 2 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 4 | 2 |
| 2015 | 3 | 2 |
| 2016 | 0 | 0 |
| 2017 | 0 | 2 |
| 2018 | 2 | 0 |
| 2019 | 2 | 1 |
| 2020 | 0 | 2 |
| 2021 | 1 | 2 |
| 2022 | 1 | 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.
- Internal combustion engine22 Mar 2022US 11,280,293 B2Coutts Industries Inc.
- Internal combustion engine6 Jul 2021US 11,053,884 B2Coutts Industries Inc.
- Air motor and pump comprising such a motor20 Aug 2019US 10,385,693 B2Exel Industries
- 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.
- Internal Combustion Engine18 Nov 2021US 2021/0355892 A1Coutts Industries Inc.
- Internal Combustion Engine25 Mar 2021US 2021/0087996 A1Coutts Industries Inc.
- Valve of Pneumatic Hammer18 Jun 2020US 2020/0189085 A1
- Intake Device of Pneumatic Hammer18 Jun 2020US 2020/0194199 A1Weijen Airtool Co., Ltd.
Most cited
By later US patents
- Dual pressure gas motor, and method of operation29US 4,286,929 A1981
- Compression spring fluid motor17US 5,137,435 AFrank and Robyn Walton 1990 Family Trust · 1992
- Diaphragm pumps12US 5,281,108 A1994
- On/off switch for liquid additive injection pump12US 6,910,405 B2Dosmatic USA, Inc. · 2005
- Impact tool11US 4,011,795 ASchroeder Brothers Corporation · 1977