F04B 1/22
Having two or more sets of cylinders or pistons
Official title: having two or more sets of cylinders or pistons
F04B1/22 (Having two or more sets of cylinders or pistons) appears on 208 US grants and 199 published applications in this corpus.
Search patents in F04B- Granted patents
- 208
- Published applications
- 199
- Assignees
- 96
- Inventors
- 352
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 0 |
| 2002 | 5 | 2 |
| 2003 | 0 | 3 |
| 2004 | 6 | 8 |
| 2005 | 5 | 12 |
| 2006 | 10 | 15 |
| 2007 | 10 | 15 |
| 2008 | 23 | 10 |
| 2009 | 8 | 8 |
| 2010 | 6 | 7 |
| 2011 | 7 | 4 |
| 2012 | 6 | 5 |
| 2013 | 5 | 8 |
| 2014 | 6 | 8 |
| 2015 | 5 | 22 |
| 2016 | 5 | 4 |
| 2017 | 7 | 14 |
| 2018 | 6 | 5 |
| 2019 | 6 | 7 |
| 2020 | 10 | 8 |
| 2021 | 7 | 10 |
| 2022 | 4 | 1 |
| 2023 | 6 | 5 |
| 2024 | 5 | 8 |
| 2025 | 4 | 8 |
| 2026 | 7 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Rotary swash plate hydraulic pump15 Sep 2026US 12,736,037 B2Kawasaki Jukogyo Kabushiki Kaisha
- Cylinder block with detected portions and hydraulic device including same15 Sep 2026US 12,736,046 B2Kawasaki Jukogyo Kabushiki Kaisha
- Rotary swash plate hydraulic pump19 May 2026US 12,631,165 B2Kawasaki Jukogyo Kabushiki Kaisha
- Hydraulic piston pump/motor with non-cantilevered pistons17 Feb 2026US 12,553,344 B2Goodrich Corporation
- Hydraulic device17 Feb 2026US 12,553,410 B2Bucher Hydraulics AG
- Axial Piston Machine in Slanted Axis Design with Pre-Compression Volume12 Feb 2026US 2026/0043393 A1Robert Bosch GmbH
- Rotary swash plate hydraulic pump1 Jan 2026US 2026/0002525 A1Kawasaki Jukogyo Kabushiki Kaisha
- Hydraulic system25 Dec 2025US 2025/0389285 A1Kawasaki Jukogyo Kabushiki Kaisha
- A hydraulic device27 Nov 2025US 2025/0361849 A1Innas B.V.
- Piston assembly for hydraulic pump13 Nov 2025US 2025/0347276 A1Goodrich Actuation Systems Limited
Most cited
By later US patents
- Dual pump apparatus comprising dual drive shafts and auxiliary pump78US 6,672,843 B1Hydro-Gear Limited Partnership · 2004
- Pump unit77US 6,425,244 B1Kanzaki Kokyukoki Mfg.Co., Ltd. · 2002
- Tandem pump unit64US 6,487,856 B1Kanzaki Kokyukoki Mfg.Co., Ltd. · 2002
- Dual pump unit55US 6,361,282 B1Brueninghaus Hydromatik GmbH · 2002
- Fixed swash plate for an axial piston machine54US 5,074,195 AKanzaki Kokyukoki Mfg.Co., Ltd. · 1991