F04C 2/00
Rotary-piston machines or pumps
Official title: Rotary-piston machines or pumps (with non-parallel axes of co-operating members F04C3/00; with the working-chamber walls at least partly resiliently deformable F04C5/00; with fluid ring or the like F04C7/00; rotary-piston pumps specially adapted for elastic fluids F04C18/00; rotary-piston machines or pumps in which the working-fluid is exclusively displaced by, or exclusively displaces, one or more reciprocating pistons F04B)
F04C2/00 (Rotary-piston machines or pumps) appears on 3,974 US grants and 3,979 published applications in this corpus.
Search patents in F04C- Granted patents
- 3,974
- Published applications
- 3,979
- Assignees
- 1,443
- Inventors
- 6,517
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 24 | 0 |
| 1977 | 24 | 0 |
| 1978 | 23 | 0 |
| 1979 | 14 | 0 |
| 1980 | 26 | 0 |
| 1981 | 26 | 0 |
| 1982 | 20 | 0 |
| 1983 | 26 | 0 |
| 1984 | 28 | 0 |
| 1985 | 43 | 0 |
| 1986 | 29 | 0 |
| 1987 | 34 | 0 |
| 1988 | 35 | 0 |
| 1989 | 20 | 0 |
| 1990 | 27 | 0 |
| 1991 | 33 | 0 |
| 1992 | 43 | 0 |
| 1993 | 34 | 0 |
| 1994 | 34 | 0 |
| 1995 | 28 | 0 |
| 1996 | 33 | 0 |
| 1997 | 44 | 0 |
| 1998 | 52 | 0 |
| 1999 | 40 | 0 |
| 2000 | 93 | 0 |
| 2001 | 76 | 14 |
| 2002 | 73 | 62 |
| 2003 | 81 | 80 |
| 2004 | 66 | 93 |
| 2005 | 43 | 109 |
| 2006 | 60 | 92 |
| 2007 | 47 | 105 |
| 2008 | 57 | 128 |
| 2009 | 64 | 154 |
| 2010 | 78 | 156 |
| 2011 | 88 | 113 |
| 2012 | 100 | 142 |
| 2013 | 115 | 208 |
| 2014 | 128 | 214 |
| 2015 | 160 | 279 |
| 2016 | 162 | 235 |
| 2017 | 215 | 222 |
| 2018 | 199 | 258 |
| 2019 | 190 | 194 |
| 2020 | 183 | 216 |
| 2021 | 176 | 190 |
| 2022 | 189 | 183 |
| 2023 | 185 | 168 |
| 2024 | 185 | 152 |
| 2025 | 146 | 118 |
| 2026 | 75 | 94 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F04C 2/08Rotary-piston machines or pumps: of intermeshing-engagement type, i.e. with engagement of co-operating2,823
- F04C 2/30Rotary-piston machines or pumps: having the characteristics covered by two or more1,013
- F04C 2/02Rotary-piston machines or pumps: of arcuate-engagement type, i.e. with circular translatory movement191
- F04C 2/22Rotary-piston machines or pumps: of internal-axis type with equidirectional movement of co-operating43
- F04C 2/24Rotary-piston machines or pumps: of counter-engagement type, i.e. the movement of co-operating11
Recent patents
- Process pump with dynamic seal for dry run capability6 Oct 2026US 12,753,757 B2Viking Pump, Inc.
- Fluid pump for an aircraft turbomachine, lubrication circuit and aircraft turbomachine6 Oct 2026US 12,753,758 B2Safran Aero Boosters SA
- Pump6 Oct 2026US 12,753,759 B2LG Innotek Co., Ltd.
- Dual oil pump with centrifugal shifter6 Oct 2026US 12,753,804 B1Schaeffler Technologies AG & Co. KG
- Gear pump for microvaporizer cartridge8 Sep 2026US 12,728,213 B2Cental Victory Limited Hk
- Rotary internal combustion engine with integrated pump8 Oct 2026US 2026/0309074 A1Pratt & Whitney Canada Corp.
- Improved Positive-Displacement Rotary Hydraulic Machine8 Oct 2026US 2026/0309149 A1Stem Numerical Engineering S.R.L.
- Screw spindle pump8 Oct 2026US 2026/0309150 A1Leistritz Pumpen GmbH
- Motor and pump comprising same1 Oct 2026US 2026/0298226 A1LG Innotek Co., Ltd.
- Electric oil pump, housing body portion, and pump cover1 Oct 2026US 2026/0298227 A1Nidec Powertrain Systems Corporation
Most cited
By later US patents
- Distributor apparatus with a pair of intermeshing screw rotors255US 9,938,972 B2Fish Engineering Limited · 2018
- Heart assist pump234US 5,112,349 AAmerican BioMed, Inc. · 1992
- Heart assist pump227US 4,964,864 AAmerican BioMed, Inc. · 1990
- System and method for driving a pump174US 8,801,394 B2Solar Turbines Incorporated · 2014
- Fluid pump changeable in diameter, in particular for medical application156US 8,944,748 B2Ecp Entwicklungsgesellschaft Mbh · 2015