F04B 9/1315
The movement of the pumping pistons in only one direction being obtained
Official title: {the movement of the pumping pistons in only one direction being obtained by a single-acting piston fluid motor, e.g. actuation in the other direction by spring means}
F04B9/1315 (The movement of the pumping pistons in only one direction being obtained) appears on 8 US grants and 3 published applications in this corpus.
Search patents in F04B- Granted patents
- 8
- Published applications
- 3
- Assignees
- 6
- Inventors
- 14
- Latest grant
- 14 Jan 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 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 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
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- Automatic oil pump, with a valved pumping piston and a valved driving piston unit12 Dec 2006US 7,147,442 B2
- Internal combustion engine oil pump4 Jan 1994US 5,275,539 AOutboard Marine Corporation
- Pump arrangement driven by compressed-air20 Nov 1990US 4,971,531 ANIKE, Inc.
Most cited
By later US patents
- Pump arrangement driven by compressed-air19US 4,971,531 ANIKE, Inc. · 1990
- Exhaust gas operated vacuum pump assembly14US 4,502,848 AGeneral Motors Corporation · 1985
- Exhaust gas operated vacuum pump assembly9US 4,502,847 AGeneral Motors Corporation · 1985
- Internal combustion engine oil pump9US 5,275,539 AOutboard Marine Corporation · 1994
- Apparatus for continuously generating hydraulic pressure7US 4,729,720 AOsaka Taiyu Co., Ltd. · 1988