F04B 11/005
Equalisation of pulses: using two or more pumping pistons
Official title: {using two or more pumping pistons}
F04B11/005 (Equalisation of pulses: using two or more pumping pistons) appears on 227 US grants and 178 published applications in this corpus.
Search patents in F04B- Granted patents
- 227
- Published applications
- 178
- Assignees
- 166
- Inventors
- 426
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 7 | 0 |
| 1985 | 4 | 0 |
| 1986 | 5 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 7 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 2 | 2 |
| 2003 | 5 | 6 |
| 2004 | 6 | 5 |
| 2005 | 2 | 12 |
| 2006 | 6 | 4 |
| 2007 | 4 | 2 |
| 2008 | 4 | 7 |
| 2009 | 4 | 6 |
| 2010 | 3 | 14 |
| 2011 | 3 | 5 |
| 2012 | 7 | 6 |
| 2013 | 3 | 7 |
| 2014 | 3 | 6 |
| 2015 | 10 | 6 |
| 2016 | 4 | 9 |
| 2017 | 8 | 9 |
| 2018 | 6 | 15 |
| 2019 | 11 | 13 |
| 2020 | 10 | 9 |
| 2021 | 6 | 10 |
| 2022 | 12 | 5 |
| 2023 | 4 | 7 |
| 2024 | 8 | 6 |
| 2025 | 4 | 5 |
| 2026 | 7 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Quadraplex fluid pump268US 4,470,771 ATowler Hydraulics, Inc. · 1984
- Reducing fluid pressure spikes in a pumping system221US 10,393,108 B2Schlumberger Technology Corporation · 2019
- Automatic pump sequencing and flow rate modulating control system216US 4,269,569 A1981
- Pumping apparatus for delivering liquid at high pressure112US 4,883,409 A1989
- Positive displacement pump and operating method thereof90US 9,695,808 B2Mhwirth AS · 2017