F04C 11/001
Combinations of two or more machines or pumps, each being of rotary-piston
Official title: {of similar working principle}
F04C11/001 (Combinations of two or more machines or pumps, each being of rotary-piston) appears on 363 US grants and 396 published applications in this corpus.
Search patents in F04C- Granted patents
- 363
- Published applications
- 396
- Assignees
- 260
- Inventors
- 776
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 5 | 0 |
| 1986 | 6 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 6 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 3 | 0 |
| 1998 | 11 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 2 |
| 2002 | 9 | 8 |
| 2003 | 13 | 8 |
| 2004 | 7 | 10 |
| 2005 | 2 | 9 |
| 2006 | 6 | 11 |
| 2007 | 5 | 5 |
| 2008 | 4 | 19 |
| 2009 | 7 | 23 |
| 2010 | 6 | 19 |
| 2011 | 5 | 16 |
| 2012 | 13 | 15 |
| 2013 | 13 | 20 |
| 2014 | 13 | 20 |
| 2015 | 14 | 23 |
| 2016 | 11 | 23 |
| 2017 | 20 | 23 |
| 2018 | 16 | 30 |
| 2019 | 15 | 10 |
| 2020 | 17 | 23 |
| 2021 | 21 | 20 |
| 2022 | 16 | 13 |
| 2023 | 17 | 16 |
| 2024 | 18 | 15 |
| 2025 | 14 | 7 |
| 2026 | 7 | 8 |
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
- Gear pump parallel load path24 Mar 2026US 12,584,482 B1Pratt & Whitney Canada Corp.
- Pump and method to attenuate pulses at the discharge24 Mar 2026US 12,584,483 B2Magpumps Limited
- Assembly for compressing gas having a housing comprising coolers in a central section, method for cooling, and use of such an assembly3 Mar 2026US 12,565,881 B2Atlas Copco Airpower, Naamloze Vennootschap
- Pump assembly with the pump disposed within the plurality of teeth of the motor stator24 Feb 2026US 12,560,166 B2Sumitomo Electric Industries, Ltd.
- Rotary internal combustion engine with integrated pump8 Oct 2026US 2026/0309074 A1Pratt & Whitney Canada Corp.
- Gear pump parallel load path30 Jul 2026US 2026/0218702 A1Pratt & Whitney Canada Corp.
- Pump assembly2 Jul 2026US 2026/0185523 A1Sumitomo Electric Sintered Alloy, Ltd.
- Pump assembly25 Jun 2026US 2026/0177203 A1Pratt & Whitney Canada Corp.
- Pump control system for a refuse vehicle14 May 2026US 2026/0131970 A1Oshkosh Corporation
Most cited
By later US patents
- Distributor apparatus with a pair of intermeshing screw rotors255US 9,938,972 B2Fish Engineering Limited · 2018
- Oil cooling apparatus for refrigeration screw compressor77US 4,419,865 AVilter Manufacturing Corporation · 1983
- Well production apparatus and method63US 6,454,010 B1Pan Canadian Petroleum Limited · 2002
- Tandem rotary pump with pressure chamber between two intermediate side plates55US 4,971,535 AToyoda Koki Kabushiki Kaisha · 1990
- Pump with conveying chamber formed in outer rotor surface55US 7,674,100 B2PDD Innovations Ltd. · 2010