F04C 2/3441
The inner and outer member being in contact along one line or
Official title: {the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation}
F04C2/3441 (The inner and outer member being in contact along one line or) appears on 380 US grants and 393 published applications in this corpus.
Search patents in F04C- Granted patents
- 380
- Published applications
- 393
- Assignees
- 183
- Inventors
- 645
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 6 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 6 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 6 | 0 |
| 1998 | 5 | 0 |
| 1999 | 3 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 2 |
| 2002 | 11 | 4 |
| 2003 | 6 | 4 |
| 2004 | 5 | 9 |
| 2005 | 3 | 15 |
| 2006 | 6 | 7 |
| 2007 | 8 | 9 |
| 2008 | 9 | 23 |
| 2009 | 9 | 34 |
| 2010 | 11 | 21 |
| 2011 | 16 | 17 |
| 2012 | 22 | 19 |
| 2013 | 21 | 23 |
| 2014 | 12 | 18 |
| 2015 | 21 | 34 |
| 2016 | 21 | 22 |
| 2017 | 27 | 16 |
| 2018 | 21 | 23 |
| 2019 | 13 | 14 |
| 2020 | 10 | 25 |
| 2021 | 15 | 17 |
| 2022 | 16 | 11 |
| 2023 | 14 | 10 |
| 2024 | 10 | 8 |
| 2025 | 8 | 4 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fluid pump for an aircraft turbomachine, lubrication circuit and aircraft turbomachine6 Oct 2026US 12,753,758 B2Safran Aero Boosters SA
- Variable displacement pump24 Feb 2026US 12,560,168 B2Hitachi Astemo, Ltd.
- Bidirectional rotary hydraulic motor and pump13 Jan 2026US 12,523,153 B2
- Single sliding vane rotary displacement pump23 Dec 2025US 12,503,942 B1Ace Machine Design Inc.
- Variable displacement oil pump21 Oct 2025US 12,448,967 B2Hitachi Astemo, Ltd.
- Lubrication system for an internal combustion engine25 Jun 2026US 2026/0176992 A1DAF Trucks N. V.
- Variable displacement oil pump and method for producing variable displacement oil pump26 Feb 2026US 2026/0055762 A1Hitachi Astemo, Ltd.
- Vane pump with hydrostatic pressure plates12 Feb 2026US 2026/0043402 A1Eaton Intelligent Power Limited
- Rotary vane pump with angular position sensing capability12 Feb 2026US 2026/0043403 A1Schaeffler Technologies AG & Co. KG
- Pump assembly for gas turbine engines4 Dec 2025US 2025/0369371 A1Rtx Corporation
Most cited
By later US patents
- Reduced rotor assembly diameter vane pump47US 7,997,882 B2MAGNA Powertrain AG & Co KG · 2011
- Combined pump and motor device45US 6,247,906 B12001
- Variable output vane pump32US 4,531,893 AKabushiki Kaisha Fujikoshi · 1985
- Rotary positive-displacement scavenging device for rotary vane pumping machine31US 6,244,240 B1Mallen Research Limited Partnership · 2001
- Variable displacement vane pump, component parts and method30US 5,545,014 AColtec Industries Inc. · 1996