F01C 1/00

Rotary-piston machines or engines

Official title: Rotary-piston machines or engines (with axes of co-operating members non parallel F01C3/00; with the working-chamber walls at least partly resiliently deformable F01C5/00; with fluid ring or the like F01C7/00; rotary-piston machines or engines in which the working fluid is exclusively displaced by, or exclusively displaces, one or more reciprocating pistons F01B13/00)

F01C1/00 (Rotary-piston machines or engines) appears on 2,386 US grants and 1,662 published applications in this corpus.

Search patents in F01C

Granted patents: 2,386
Published applications: 1,662
Assignees: 719
Inventors: 3,092
Latest grant: 18 Aug 2026

Filings by year

F01C 1/00: granted patents and published applications per publication year
Year	Granted patents	Published applications
1976	119	0
1977	62	0
1978	49	0
1979	37	0
1980	38	0
1981	19	0
1982	22	0
1983	43	0
1984	56	0
1985	31	0
1986	23	0
1987	45	0
1988	33	0
1989	32	0
1990	37	0
1991	31	0
1992	38	0
1993	30	0
1994	50	0
1995	36	0
1996	29	0
1997	19	0
1998	33	0
1999	18	0
2000	53	0
2001	40	6
2002	39	23
2003	38	49
2004	36	59
2005	36	69
2006	47	78
2007	32	61
2008	38	70
2009	41	69
2010	49	86
2011	43	71
2012	48	53
2013	49	92
2014	71	112
2015	74	110
2016	86	100
2017	87	99
2018	91	88
2019	86	59
2020	79	81
2021	75	65
2022	60	34
2023	41	36
2024	63	33
2025	36	40
2026	18	19

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

Rotary-piston machines or engines

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