F04C 9/00
Oscillating-piston machines or pumps
Official title: Oscillating-piston machines or pumps (such pumps specially adapted for elastic fluids F04C21/00)
F04C9/00 (Oscillating-piston machines or pumps) appears on 66 US grants and 57 published applications in this corpus.
Search patents in F04C- Granted patents
- 66
- Published applications
- 57
- Assignees
- 49
- Inventors
- 104
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 2 |
| 2005 | 0 | 2 |
| 2006 | 1 | 2 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 2 |
| 2010 | 1 | 4 |
| 2011 | 0 | 1 |
| 2012 | 2 | 5 |
| 2013 | 2 | 6 |
| 2014 | 2 | 5 |
| 2015 | 8 | 3 |
| 2016 | 2 | 0 |
| 2017 | 4 | 5 |
| 2018 | 3 | 5 |
| 2019 | 4 | 2 |
| 2020 | 3 | 5 |
| 2021 | 4 | 3 |
| 2022 | 4 | 2 |
| 2023 | 2 | 2 |
| 2024 | 3 | 1 |
| 2025 | 0 | 0 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Moving wall multiphase compressor-pump-expander system21 Apr 2026US 12,607,188 B1
- Magnetic drive apparatus for translating rotational motion to nutational motion20 Jan 2026US 12,531,464 B2Magvad LLC
- Radial piston machine with brake17 Dec 2024US 12,169,006 B2Robert Bosch GmbH
- Vacuum sealable container with internal pump mechanism30 Apr 2024US 11,970,328 B2HBL Holdings, LLC
- Two-dimensional motor piston pump6 Feb 2024US 11,891,997 B2Hangzhou City University
- Magnetic drive apparatus for translating rotational motion to nutational motion12 Dec 2024US 2024/0413728 A1Magvad LLC
- Two-dimensional motor piston pump23 Nov 2023US 2023/0374986 A1Hangzhou City University
- Spherical puffing pump for ice cream machine and air inlet device thereof2 Feb 2023US 2023/0029836 A1Shenzhen Ansonpower Technology Co., Ltd.
- Vacuum Sealable Container with Internal Pump Mechanism1 Dec 2022US 2022/0380110 A1HBL Holdings, LLC
- Radial Piston Machine with Brake2 Jun 2022US 2022/0170460 A1Robert Bosch GmbH
Most cited
By later US patents
- Mechanically operated dispensing device for increasing discharge pressure and dispensing time41US 4,167,941 AJames D. Pauls, Ltd. (Limited Partnership) · 1979
- Internal combustion engine that completes four cycles in one revolution of the crankshaft28US 6,474,288 B12002
- Rigid-vane artifical heart25US 4,310,930 AU. S. Philips Corporation · 1982
- Pump module, pump base module and pump system21US 9,470,220 B2Fresenius Kabu Deutschland GmbH · 2016
- Mechanically operated mixing dispenser having a plurality of expansible chambers and a plurality of accumulating chambers20US 4,176,764 AJames D. Pauls, Ltd. · 1979