F04B 1/00

Multi-cylinder machines or pumps characterised by number or arrangement of cylinders

Official title: Multi-cylinder machines or pumps characterised by number or arrangement of cylinders (machines or pumps with pistons coacting within one cylinder F04B3/00)

F04B1/00 (Multi-cylinder machines or pumps characterised by number or arrangement of cylinders) appears on 3,681 US grants and 3,176 published applications in this corpus.

Search patents in F04B

Granted patents: 3,681
Published applications: 3,176
Assignees: 1,197
Inventors: 5,574
Latest grant: 6 Oct 2026

Filings by year

F04B 1/00: granted patents and published applications per publication year
Year	Granted patents	Published applications
1976	70	0
1977	42	0
1978	40	0
1979	33	0
1980	19	0
1981	32	0
1982	28	0
1983	17	0
1984	46	0
1985	35	0
1986	31	0
1987	33	0
1988	32	0
1989	31	0
1990	45	0
1991	44	0
1992	36	0
1993	49	0
1994	35	0
1995	21	0
1996	40	0
1997	54	0
1998	62	0
1999	60	0
2000	62	0
2001	84	15
2002	89	65
2003	90	78
2004	71	94
2005	55	82
2006	61	100
2007	54	86
2008	65	74
2009	45	105
2010	63	100
2011	49	79
2012	65	87
2013	71	131
2014	70	139
2015	102	181
2016	110	161
2017	132	181
2018	137	171
2019	196	173
2020	164	192
2021	160	157
2022	157	148
2023	151	171
2024	159	169
2025	162	144
2026	122	93

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

Multi-cylinder machines or pumps characterised by number or arrangement of cylinders

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