F01L 15/12
Valve-gear or valve arrangements: characterised by having means for effecting pressure equilibrium
Official title: characterised by having means for effecting pressure equilibrium between two different cylinder spaces at idling
F01L15/12 (Valve-gear or valve arrangements: characterised by having means for effecting pressure equilibrium) appears on 6 US grants and 1 published applications in this corpus.
Search patents in F01L- Granted patents
- 6
- Published applications
- 1
- Assignees
- 1
- Inventors
- 7
- Latest grant
- 14 Jan 2003
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Multicylinder self-starting uniflow engine14 Jan 2003US 6,505,538 B1
- Piston apparatus for gas/liquid pipeline31 Dec 2002US 6,499,384 B1
- Reciprocating pneumatic motor for hydraulics30 Aug 1994US 5,341,723 A
- Control device for pneumatic cylinder4 Jan 1994US 5,275,085 A
- Hydraulically driven reciprocating motor10 Jul 1984US 4,458,579 A
Most cited
By later US patents
- Reciprocating pneumatic motor for hydraulics15US 5,341,723 A1994
- Hydraulically actuated pump assembly having mechanically actuated valve means12US 4,214,854 A1980
- Control device for pneumatic cylinder5US 5,275,085 A1994
- Hydraulically driven reciprocating motor2US 4,458,579 A1984
- Piston apparatus for gas/liquid pipeline2US 6,499,384 B12002