F04C 11/00
Combinations of two or more machines or pumps, each being of rotary-piston
Official title: Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type (combinations of such pumps specially adapted for elastic fluids F04C23/00); Pumping installations (F04C13/00 takes precedence; specially adapted for elastic fluids F04C23/00; fluid gearing F16H)
F04C11/00 (Combinations of two or more machines or pumps, each being of rotary-piston) appears on 822 US grants and 831 published applications in this corpus.
Search patents in F04C- Granted patents
- 822
- Published applications
- 831
- Assignees
- 492
- Inventors
- 1,791
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 11 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 6 | 0 |
| 1984 | 5 | 0 |
| 1985 | 13 | 0 |
| 1986 | 10 | 0 |
| 1987 | 10 | 0 |
| 1988 | 2 | 0 |
| 1989 | 9 | 0 |
| 1990 | 8 | 0 |
| 1991 | 8 | 0 |
| 1992 | 5 | 0 |
| 1993 | 10 | 0 |
| 1994 | 8 | 0 |
| 1995 | 10 | 0 |
| 1996 | 16 | 0 |
| 1997 | 15 | 0 |
| 1998 | 16 | 0 |
| 1999 | 9 | 0 |
| 2000 | 14 | 0 |
| 2001 | 12 | 5 |
| 2002 | 16 | 15 |
| 2003 | 23 | 28 |
| 2004 | 20 | 22 |
| 2005 | 12 | 19 |
| 2006 | 13 | 21 |
| 2007 | 8 | 13 |
| 2008 | 9 | 34 |
| 2009 | 12 | 32 |
| 2010 | 13 | 33 |
| 2011 | 14 | 26 |
| 2012 | 26 | 35 |
| 2013 | 19 | 42 |
| 2014 | 27 | 43 |
| 2015 | 24 | 48 |
| 2016 | 24 | 45 |
| 2017 | 38 | 43 |
| 2018 | 38 | 49 |
| 2019 | 30 | 37 |
| 2020 | 36 | 48 |
| 2021 | 43 | 44 |
| 2022 | 38 | 36 |
| 2023 | 35 | 32 |
| 2024 | 35 | 34 |
| 2025 | 38 | 30 |
| 2026 | 19 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Dual oil pump with centrifugal shifter6 Oct 2026US 12,753,804 B1Schaeffler Technologies AG & Co. KG
- Operable implant11 Aug 2026US 12,702,752 B2
- Fluid handling protection system28 Jul 2026US 12,693,692 B2Binks US, LLC
- Automotive electric oil pump21 Jul 2026US 12,687,166 B2Pierburg Pump Technology GmbH
- Pump assembly7 Jul 2026US 12,674,453 B2Sumitomo Electric Sintered Alloy, Ltd.
- Rotary internal combustion engine with integrated pump8 Oct 2026US 2026/0309074 A1Pratt & Whitney Canada Corp.
- Electric oil pump, housing body portion, and pump cover1 Oct 2026US 2026/0298227 A1Nidec Powertrain Systems Corporation
- Motor and pump comprising same13 Aug 2026US 2026/0238067 A1LG Innotek Co., Ltd.
- Gear pump parallel load path30 Jul 2026US 2026/0218702 A1Pratt & Whitney Canada Corp.
- Pump assembly2 Jul 2026US 2026/0185523 A1Sumitomo Electric Sintered Alloy, Ltd.
Most cited
By later US patents
- Distributor apparatus with a pair of intermeshing screw rotors255US 9,938,972 B2Fish Engineering Limited · 2018
- System and method for driving a pump174US 8,801,394 B2Solar Turbines Incorporated · 2014
- Overheat protection for fluid pump89US 6,837,688 B2Standex International Corporation · 2005
- Oil cooling apparatus for refrigeration screw compressor77US 4,419,865 AVilter Manufacturing Corporation · 1983
- Brushless coolant pump and cooling system73US 6,447,270 B1Isothermal Systems Research, Inc. · 2002