F04B 9/1172
The movement of each pump piston in the two directions being obtained
Official title: {the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor}
F04B9/1172 (The movement of each pump piston in the two directions being obtained) appears on 73 US grants and 39 published applications in this corpus.
Search patents in F04B- Granted patents
- 73
- Published applications
- 39
- Assignees
- 57
- Inventors
- 146
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 5 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 3 | 2 |
| 2003 | 3 | 2 |
| 2004 | 2 | 4 |
| 2005 | 2 | 3 |
| 2006 | 3 | 0 |
| 2007 | 2 | 0 |
| 2008 | 1 | 4 |
| 2009 | 1 | 0 |
| 2010 | 0 | 2 |
| 2011 | 2 | 2 |
| 2012 | 0 | 0 |
| 2013 | 2 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 1 |
| 2016 | 2 | 0 |
| 2017 | 0 | 1 |
| 2018 | 3 | 4 |
| 2019 | 0 | 1 |
| 2020 | 2 | 2 |
| 2021 | 1 | 0 |
| 2022 | 1 | 2 |
| 2023 | 0 | 3 |
| 2024 | 2 | 2 |
| 2025 | 4 | 1 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for operating a construction-material and/or viscous-material pump for conveying construction material and/or viscous material, and construction-material and/or viscous-material pump for conveying construction material and/or viscous material28 Jul 2026US 12,692,860 B2Putzmeister Engineering GmbH
- Conveying device17 Feb 2026US 12,553,430 B2Hydac Technology GmbH
- Fluid injection or suction device29 Apr 2025US 12,286,984 B2Fuji Filter Manufacturing Co., Ltd.
- Intensifier and atomizer using intensifier22 Apr 2025US 12,280,341 B2Sugino Machine Limited
- Pressure exchanger8 Apr 2025US 12,270,422 B2Danfoss A/S
- Double acting pump25 Jun 2026US 2026/0177042 A1Mhwirth AS
- Hydraulic Drive System for a Construction and/or Thick Matter Pump System, Construction and/or Thick Matter Pump System, and Method for Operating a Hydraulic Drive System and/or a Construction and/or Thick Matter Pump System9 Jan 2025US 2025/0012298 A1Putzmeister Engineering GmbH
- Conveying Device20 Jun 2024US 2024/0200542 A1Hydac Technology GmbH
- Fluid injection or suction device22 Feb 2024US 2024/0060518 A1Fuji Filter Manufacturing Co., Ltd.
- Method for Operating a Construction-Material And/or Viscous-Material Pump for Conveying Construction Material And/or Viscous Material, and Construction-Material And/or Viscous-Material Pump for Conveying Construction Material And/or Viscous Material24 Aug 2023US 2023/0265843 A1Putzmeister Engineering GmbH
Most cited
By later US patents
- Diaphragm pump139US 4,778,356 A1988
- Method and apparatus for compressing gases with a liquid system96US 5,169,295 ATren Fuels, Inc. · 1992
- Method and apparatus for compressing gases with a liquid system70US 5,387,089 ATren Fuels, Inc. · 1995
- Hydraulic intensifier63US 3,967,542 AKelsey-Hayes Company · 1976
- Water-powered sump pump47US 6,527,518 B22003