F03C 2/00
Rotary-piston engines
Official title: Rotary-piston engines (in which the liquid exclusively displaces one or more piston reciprocating in rotary cylinders F03C1/24)
F03C2/00 (Rotary-piston engines) appears on 198 US grants and 185 published applications in this corpus.
Search patents in F03C- Granted patents
- 198
- Published applications
- 185
- Assignees
- 105
- Inventors
- 327
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 1 |
| 2003 | 2 | 4 |
| 2004 | 4 | 2 |
| 2005 | 4 | 6 |
| 2006 | 1 | 8 |
| 2007 | 5 | 7 |
| 2008 | 3 | 5 |
| 2009 | 3 | 6 |
| 2010 | 5 | 3 |
| 2011 | 3 | 12 |
| 2012 | 5 | 6 |
| 2013 | 6 | 10 |
| 2014 | 9 | 12 |
| 2015 | 12 | 14 |
| 2016 | 11 | 13 |
| 2017 | 11 | 14 |
| 2018 | 9 | 11 |
| 2019 | 14 | 8 |
| 2020 | 12 | 8 |
| 2021 | 12 | 12 |
| 2022 | 7 | 1 |
| 2023 | 6 | 8 |
| 2024 | 5 | 5 |
| 2025 | 8 | 5 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F03C 2/08Rotary-piston engines: of intermeshing-engagement type, i.e. with engagement of co- operating members136
- F03C 2/30Rotary-piston engines: having the characteristics covered by two or more of groups40
- F03C 2/02Rotary-piston engines: of arcuate-engagement type, i.e. with circular translatory movement of co-operating11
- F03C 2/22Rotary-piston engines: of internal-axis type with equidirectional movement of co-operating members at3
- F03C 2/24Rotary-piston engines: of counter-engagement type, i.e. the movement of co-operating members at0
Recent patents
- Rubber compound reinforced with alternative fibers23 Jun 2026US 12,661,856 B2Abaco Drilling Technologies LLC
- Fluid rotary machine with an encoder module23 Jun 2026US 12,662,985 B2Danfoss Power Solutions ApS
- Split-type blade, fluid driving device and fluid driving proportional mixer19 May 2026US 12,629,648 B2Shanghai Vision Mechanical Joint Co., Ltd.
- Bidirectional rotary hydraulic motor and pump13 Jan 2026US 12,523,153 B2
- Hydraulic device, hydraulic motor and construction machine30 Sep 2025US 12,428,808 B2Nabtesco Corporation
- Rubber compound reinforced with low-modulus fibers16 Jul 2026US 2026/0200188 A1Abaco Drilling Technologies LLC
- Hydraulic Motor with an Enhanced Multi-Purpose Passage9 Jul 2026US 2026/0194037 A1Parker-Hannifin Corporation
- Joint for downhole motor23 Apr 2026US 2026/0110221 A1
- Flow-through pulsing assembly for use in downhole operations27 Nov 2025US 2025/0361793 A1
- Rubber compound reinforced with alternative fibers28 Aug 2025US 2025/0270997 A1Abaco Drilling Technologies LLC
Most cited
By later US patents
- Reverse Moineau motor and centrifugal pump assembly for producing fluids from a well46US 5,611,397 A1997
- Progressive cavity motors using composite materials44US 6,183,226 B22001
- Progressive cavity pumps using composite materials40US 5,759,019 A1998
- Down hole motor36US 4,415,316 AChristensen, Inc. · 1983
- Reverse Moineau motor and pump assembly for producing fluids from a well31US 5,417,281 A1995