F04F
Pumping of fluid by direct contact of another fluid or by using
Official title: PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED {(evacuating by sorption F04B)}; SIPHONS {(conveying materials in bulk by flows of gas, liquid of foam B65G53/00)}
F04F (Pumping of fluid by direct contact of another fluid or by using) appears on 2,511 US grants and 2,168 published applications in this corpus.
Search patents in F04F- Granted patents
- 2,511
- Published applications
- 2,168
- Assignees
- 1,144
- Inventors
- 4,265
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 33 | 0 |
| 1977 | 30 | 0 |
| 1978 | 37 | 0 |
| 1979 | 23 | 0 |
| 1980 | 21 | 0 |
| 1981 | 34 | 0 |
| 1982 | 38 | 0 |
| 1983 | 44 | 0 |
| 1984 | 24 | 0 |
| 1985 | 28 | 0 |
| 1986 | 29 | 0 |
| 1987 | 25 | 0 |
| 1988 | 25 | 0 |
| 1989 | 41 | 0 |
| 1990 | 23 | 0 |
| 1991 | 38 | 0 |
| 1992 | 29 | 0 |
| 1993 | 25 | 0 |
| 1994 | 39 | 0 |
| 1995 | 25 | 0 |
| 1996 | 29 | 0 |
| 1997 | 34 | 0 |
| 1998 | 27 | 0 |
| 1999 | 34 | 0 |
| 2000 | 57 | 0 |
| 2001 | 64 | 7 |
| 2002 | 53 | 41 |
| 2003 | 52 | 62 |
| 2004 | 46 | 62 |
| 2005 | 35 | 54 |
| 2006 | 41 | 55 |
| 2007 | 24 | 45 |
| 2008 | 21 | 59 |
| 2009 | 23 | 60 |
| 2010 | 29 | 86 |
| 2011 | 42 | 72 |
| 2012 | 52 | 98 |
| 2013 | 65 | 117 |
| 2014 | 77 | 95 |
| 2015 | 63 | 120 |
| 2016 | 58 | 134 |
| 2017 | 110 | 103 |
| 2018 | 101 | 122 |
| 2019 | 125 | 118 |
| 2020 | 114 | 105 |
| 2021 | 98 | 108 |
| 2022 | 85 | 108 |
| 2023 | 103 | 103 |
| 2024 | 103 | 112 |
| 2025 | 89 | 66 |
| 2026 | 46 | 56 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F04F 5/00Jet pumps, i.e. devices in which flow is induced by pressure drop1,435
- F04F 1/00Pumps using positively or negatively pressurised fluid medium acting directly on the533
- F04F 13/00Pressure exchangers211
- F04F 7/00Pumps displacing fluids by using inertia thereof172
- F04F 10/00Siphons144
- F04F 3/00Pumps using negative pressure acting directly on the liquid to be pumped69
- F04F 9/00Diffusion pumps37
- F04F 99/00Subject matter not provided for in other groups of this subclass34
Recent patents
- Blower6 Oct 2026US 12,753,779 B2LG Electronics Inc.
- System for controlling temperature and pressure inside a propellant tank29 Sep 2026US 12,747,742 B1United Launch Alliance, L.L.C.
- Two-stage jet device with flow guide structure15 Sep 2026US 12,736,066 B2Jiangsu University
- Hybrid gettering diffusion pump8 Sep 2026US 12,729,670 B2Helion Energy, Inc.
- Enhancing efficiency in a pressure exchanger8 Sep 2026US 12,729,698 B2Energy Recovery, Inc.
- Geothermal and geopressure recovery systems1 Oct 2026US 2026/0298213 A1Sage Geosystems Inc.
- Semi-hermetic motorized pressure exchanger1 Oct 2026US 2026/0298266 A1Energy Recovery, Inc.
- Pumping Device, Pumping Method, and Radiation Generator Thereof1 Oct 2026US 2026/0298267 A1Brightest Technology Taiwan Co., Ltd.
- Pump arrangement24 Sep 2026US 2026/0286983 A1ECP Entwicklungsgesselschaft mbH
- Non-electromechanical, pumpless liquid recirculation system for air-cooled condenser and cooler adiabatic pre-cooling system24 Sep 2026US 2026/0287262 A1
Most cited
By later US patents
- Vacuum trap388US 9,057,388 B2International Business Machines Corporation · 2015
- Microfluidic actuator224US 6,521,188 B1Industrial Technology Research Institute · 2003
- Gas turbine inlet air combined pressure boost and cooling method and apparatus207US 5,537,813 ACarolina Power & Light Company · 1996
- Magnetically actuated fluid handling devices for microfluidic applications164US 6,415,821 B2University of Washington · 2002
- Pump arrangement149US 9,328,741 B2Ecp Entwicklungsgesellschaft Mbh · 2016