F04C 2/08
Rotary-piston machines or pumps: of intermeshing-engagement type, i.e. with engagement of co-operating
Official title: of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
F04C2/08 (Rotary-piston machines or pumps: of intermeshing-engagement type, i.e. with engagement of co-operating) appears on 2,823 US grants and 2,822 published applications in this corpus.
Search patents in F04C- Granted patents
- 2,823
- Published applications
- 2,822
- Assignees
- 1,135
- Inventors
- 4,750
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 20 | 0 |
| 1977 | 19 | 0 |
| 1978 | 17 | 0 |
| 1979 | 11 | 0 |
| 1980 | 19 | 0 |
| 1981 | 18 | 0 |
| 1982 | 17 | 0 |
| 1983 | 19 | 0 |
| 1984 | 20 | 0 |
| 1985 | 21 | 0 |
| 1986 | 15 | 0 |
| 1987 | 25 | 0 |
| 1988 | 29 | 0 |
| 1989 | 16 | 0 |
| 1990 | 21 | 0 |
| 1991 | 23 | 0 |
| 1992 | 37 | 0 |
| 1993 | 27 | 0 |
| 1994 | 28 | 0 |
| 1995 | 24 | 0 |
| 1996 | 22 | 0 |
| 1997 | 33 | 0 |
| 1998 | 37 | 0 |
| 1999 | 27 | 0 |
| 2000 | 68 | 0 |
| 2001 | 62 | 8 |
| 2002 | 45 | 45 |
| 2003 | 59 | 60 |
| 2004 | 53 | 75 |
| 2005 | 32 | 78 |
| 2006 | 46 | 71 |
| 2007 | 35 | 81 |
| 2008 | 39 | 88 |
| 2009 | 48 | 105 |
| 2010 | 57 | 116 |
| 2011 | 61 | 81 |
| 2012 | 71 | 106 |
| 2013 | 76 | 131 |
| 2014 | 102 | 153 |
| 2015 | 103 | 169 |
| 2016 | 98 | 162 |
| 2017 | 131 | 139 |
| 2018 | 126 | 185 |
| 2019 | 141 | 141 |
| 2020 | 135 | 155 |
| 2021 | 138 | 136 |
| 2022 | 132 | 122 |
| 2023 | 115 | 123 |
| 2024 | 132 | 120 |
| 2025 | 115 | 95 |
| 2026 | 58 | 77 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
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
- Thermistor flow path8 Sep 2026US 12,729,681 B2GHSP, Inc.
- 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
- Direct drive linear flow blood pump134US 7,074,018 B22006