F04C 18/02

Rotary-piston pumps specially adapted for elastic fluids: of arcuate-engagement type, i.e. with

Official title: of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents

F04C18/02 (Rotary-piston pumps specially adapted for elastic fluids: of arcuate-engagement type, i.e. with) appears on 3,088 US grants and 3,070 published applications in this corpus.

Search patents in F04C

Granted patents: 3,088
Published applications: 3,070
Assignees: 397
Inventors: 3,678
Latest grant: 6 Oct 2026

Filings by year

F04C 18/02: granted patents and published applications per publication year
Year	Granted patents	Published applications
1980	2	0
1981	3	0
1982	4	0
1983	3	0
1984	13	0
1985	14	0
1986	3	0
1987	14	0
1988	15	0
1989	23	0
1990	19	0
1991	27	0
1992	32	0
1993	32	0
1994	43	0
1995	41	0
1996	53	0
1997	38	0
1998	52	0
1999	24	0
2000	77	0
2001	94	28
2002	90	85
2003	68	84
2004	73	83
2005	45	87
2006	60	114
2007	73	85
2008	66	77
2009	44	120
2010	59	136
2011	75	115
2012	102	86
2013	80	133
2014	78	143
2015	103	144
2016	118	144
2017	113	125
2018	120	139
2019	123	155
2020	124	177
2021	164	123
2022	150	153
2023	122	142
2024	207	124
2025	130	135
2026	75	133

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

Rotary-piston pumps specially adapted for elastic fluids: of arcuate-engagement type, i.e. with

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