F04F 3/00
Pumps using negative pressure acting directly on the liquid to be pumped
Official title: Pumps using negative pressure acting directly on the liquid to be pumped (siphons F04F10/00)
F04F3/00 (Pumps using negative pressure acting directly on the liquid to be pumped) appears on 69 US grants and 56 published applications in this corpus.
Search patents in F04F- Granted patents
- 69
- Published applications
- 56
- Assignees
- 39
- Inventors
- 96
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 4 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 0 |
| 2003 | 1 | 3 |
| 2004 | 5 | 4 |
| 2005 | 4 | 0 |
| 2006 | 2 | 1 |
| 2007 | 0 | 4 |
| 2008 | 1 | 3 |
| 2009 | 0 | 2 |
| 2010 | 4 | 1 |
| 2011 | 2 | 1 |
| 2012 | 0 | 7 |
| 2013 | 1 | 2 |
| 2014 | 3 | 3 |
| 2015 | 1 | 2 |
| 2016 | 3 | 2 |
| 2017 | 0 | 0 |
| 2018 | 1 | 3 |
| 2019 | 2 | 1 |
| 2020 | 3 | 4 |
| 2021 | 2 | 3 |
| 2022 | 0 | 2 |
| 2023 | 4 | 2 |
| 2024 | 1 | 3 |
| 2025 | 2 | 1 |
| 2026 | 5 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Vacuum air lift systems including a fluidic oscillator28 Jul 2026US 12,692,177 B2Searen, LLC
- Conveying device for conveying a liquid/gas mixture taken from a borehole16 Jun 2026US 12,655,856 B2Leistritz Pumpen GmbH
- Vacuum generator and negative pressure dust suction device having same12 May 2026US 12,622,555 B2Contemporary Amperex Technology (Hong Kong) Limited
- Looping water device3 Mar 2026US 12,565,872 B1Yu Ding Enterprise Co., Ltd
- Motionless molten salt pump on leverage of pressure variation force10 Feb 2026US 12,546,337 B2UNM Rainforest Innovations
- Looping water device19 Mar 2026US 2026/0078732 A1Yu Ding Enterprise Co., Ltd
- Motionless Molten Salt Pump on Leverage of Pressure Variation Force12 Jun 2025US 2025/0188955 A1UNM Rainforest Innovations
- Conveying device for conveying a liquid/gas mixture taken from a borehole7 Nov 2024US 2024/0369077 A1Leistritz Pumpen GmbH
- Improvements relating to siphon systems and vacuum pumps7 Mar 2024US 2024/0077144 A1
- Vacuum generator and negative pressure dust suction device having same22 Feb 2024US 2024/0057833 A1Contemporary Amperex Technology Co., Limited
Most cited
By later US patents
- Microfluidic actuator224US 6,521,188 B1Industrial Technology Research Institute · 2003
- Wet-dry vacuum apparatus with pump means for discharging liquid therefrom61US 4,080,104 A1978
- Pre-charged vacuum fluid change/disposal apparatus29US 5,772,402 A1998
- Pressure differential liquid transfer system23US 4,339,232 A1982
- Apparatus to increase oil well flow23US 4,345,647 A1982