F04B 9/1115

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 liquid motor, e.g. actuation in the other direction by spring means}

F04B9/1115 (The movement of the pumping pistons in only one direction being obtained) appears on 13 US grants and 3 published applications in this corpus.

Search patents in F04B

Granted patents: 13
Published applications: 3
Assignees: 8
Inventors: 12
Latest grant: 27 Jan 2026

Filings by year

F04B 9/1115: granted patents and published applications per publication year
Year	Granted patents	Published applications
1978	1	0
1979	0	0
1980	0	0
1981	1	0
1982	1	0
1983	0	0
1984	1	0
1985	0	0
1986	1	0
1987	0	0
1988	1	0
1989	0	0
1990	0	0
1991	0	0
1992	0	0
1993	1	0
1994	0	0
1995	1	0
1996	0	0
1997	0	0
1998	2	0
1999	0	0
2000	0	0
2001	0	0
2002	1	0
2003	1	1
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	0
2014	0	0
2015	0	0
2016	0	0
2017	0	0
2018	0	0
2019	0	0
2020	0	0
2021	0	0
2022	0	0
2023	0	0
2024	0	0
2025	0	1
2026	1	1

By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.

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