F04B 49/246
By keeping open the outlet valve
Official title: {by keeping open the outlet valve}
F04B49/246 (By keeping open the outlet valve) appears on 34 US grants and 14 published applications in this corpus.
Search patents in F04B- Granted patents
- 34
- Published applications
- 14
- Assignees
- 27
- Inventors
- 71
- Latest grant
- 26 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 5 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 2 |
| 2013 | 0 | 2 |
| 2014 | 0 | 0 |
| 2015 | 2 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 2 |
| 2019 | 1 | 0 |
| 2020 | 1 | 2 |
| 2021 | 3 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
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- Liquid metering device for metering pumps5 Jan 2021US 10,884,439 B2Advanced Development and Innovation, S.L.
- Direct controlled variable displacement valves with dual set point pressure relief28 Nov 2024US 2024/0392773 A1Hamilton Sundstrand Corporation
- Variable Displacement Pumps27 Apr 2023US 2023/0125840 A1Hamilton Sundstrand Corporation
- Liquid metering device for metering pumps19 Nov 2020US 2020/0362849 A1Advanced Development and Innovation, S.L.
- Systems and methods for killing wells equipped with jet pumps16 Apr 2020US 2020/0115999 A1Hansen Downhole Pump Solutions A.S.
- Hydraulic system for maintaining minimum low side pressure of closed circuit hydraulic system11 Oct 2018US 2018/0291797 A1Danfoss Power Solutions Inc.
Most cited
By later US patents
- Fuel pump assembly22US 6,142,747 ARobert Bosch GmbH · 2000
- Adjustable suck-back device for sanitary pumps17US 4,230,160 ANational Instrument Company, Inc. · 1980
- Multi-cylinder variable delivery compressor16US 4,403,921 AKabushiki Kaisha Toyoda Jidoshokki Seisakusho · 1983
- Cartridge assembly with orifice providing pressure differential15US 5,378,118 ATRW Inc. · 1995
- Synchronized unloader system and method for a gas compressor15US 5,695,325 A1997