F04B 1/12
Multi-cylinder machines or pumps characterised by number or arrangement of cylinders: having
Official title: having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
F04B1/12 (Multi-cylinder machines or pumps characterised by number or arrangement of cylinders: having) appears on 1,851 US grants and 1,457 published applications in this corpus.
Search patents in F04B- Granted patents
- 1,851
- Published applications
- 1,457
- Assignees
- 617
- Inventors
- 2,823
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 30 | 0 |
| 1977 | 17 | 0 |
| 1978 | 16 | 0 |
| 1979 | 13 | 0 |
| 1980 | 10 | 0 |
| 1981 | 16 | 0 |
| 1982 | 12 | 0 |
| 1983 | 9 | 0 |
| 1984 | 31 | 0 |
| 1985 | 22 | 0 |
| 1986 | 19 | 0 |
| 1987 | 18 | 0 |
| 1988 | 22 | 0 |
| 1989 | 20 | 0 |
| 1990 | 27 | 0 |
| 1991 | 25 | 0 |
| 1992 | 22 | 0 |
| 1993 | 31 | 0 |
| 1994 | 14 | 0 |
| 1995 | 12 | 0 |
| 1996 | 24 | 0 |
| 1997 | 31 | 0 |
| 1998 | 43 | 0 |
| 1999 | 35 | 0 |
| 2000 | 42 | 0 |
| 2001 | 42 | 5 |
| 2002 | 50 | 32 |
| 2003 | 47 | 42 |
| 2004 | 37 | 46 |
| 2005 | 35 | 53 |
| 2006 | 40 | 62 |
| 2007 | 35 | 45 |
| 2008 | 47 | 31 |
| 2009 | 27 | 47 |
| 2010 | 29 | 51 |
| 2011 | 20 | 41 |
| 2012 | 29 | 35 |
| 2013 | 32 | 53 |
| 2014 | 34 | 69 |
| 2015 | 52 | 103 |
| 2016 | 51 | 80 |
| 2017 | 67 | 95 |
| 2018 | 70 | 62 |
| 2019 | 83 | 71 |
| 2020 | 75 | 90 |
| 2021 | 77 | 77 |
| 2022 | 71 | 57 |
| 2023 | 64 | 60 |
| 2024 | 67 | 64 |
| 2025 | 59 | 51 |
| 2026 | 50 | 35 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electrohydraulic control device and adjustable hydraulic pump system6 Oct 2026US 12,753,781 B2HAWE Hydraulik SE
- Solenoid concept for pump control of a variable displacement piston pump29 Sep 2026US 12,747,727 B2Hamilton Sundstrand Corporation
- Rotary swash plate hydraulic pump15 Sep 2026US 12,736,037 B2Kawasaki Jukogyo Kabushiki Kaisha
- Hydraulic motor15 Sep 2026US 12,736,038 B2Nachi-Fujikoshi Corp.
- Cylinder block with detected portions and hydraulic device including same15 Sep 2026US 12,736,046 B2Kawasaki Jukogyo Kabushiki Kaisha
- Active checked multiple displacer assembly1 Oct 2026US 2026/0298217 A1Graco Minnesota Inc.
- Hydrostatic Rotary Machine Having Counting Apertures on a Second Brake Disc24 Sep 2026US 2026/0286951 A1Robert Bosch GmbH
- Positive displacement pump17 Sep 2026US 2026/0275969 A1
- Hydraulic pump state monitoring device and hydraulic drive system10 Sep 2026US 2026/0266272 A1Hitachi Construction Machinery Co., Ltd.
- Improved axial piston hydraulic machine6 Aug 2026US 2026/0226888 A1
Most cited
By later US patents
- Mobile, modular, electrically powered system for use in fracturing underground formations using liquid petroleum gas341US 9,140,110 B2Evolution Well Services, LLC · 2015
- Electric blender system, apparatus and method for use in fracturing underground formations using liquid petroleum gas225US 10,107,085 B2Evolution Well Services, LLC · 2018
- System and method for dedicated electric source for use in fracturing underground formations using liquid petroleum gas223US 10,107,084 B2Evolution Well Services, LLC · 2018
- Electronic control for a rotary fluid device171US 10,100,827 B2Eaton Intelligent Power Limited · 2018
- Mobile, modular, electrically powered system for use in fracturing underground formations using liquid petroleum gas145US 9,475,020 B2Evolution Well Services, LLC · 2016