F04B 25/02
Multi-stage pumps: of stepped piston type
Official title: of stepped piston type
F04B25/02 (Multi-stage pumps: of stepped piston type) appears on 99 US grants and 77 published applications in this corpus.
Search patents in F04B- Granted patents
- 99
- Published applications
- 77
- Assignees
- 67
- Inventors
- 171
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 5 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 2 |
| 2003 | 2 | 1 |
| 2004 | 2 | 5 |
| 2005 | 2 | 5 |
| 2006 | 0 | 3 |
| 2007 | 3 | 3 |
| 2008 | 3 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 2 | 3 |
| 2013 | 2 | 3 |
| 2014 | 1 | 1 |
| 2015 | 1 | 3 |
| 2016 | 1 | 2 |
| 2017 | 3 | 1 |
| 2018 | 2 | 5 |
| 2019 | 2 | 7 |
| 2020 | 4 | 3 |
| 2021 | 4 | 8 |
| 2022 | 7 | 4 |
| 2023 | 6 | 6 |
| 2024 | 5 | 4 |
| 2025 | 5 | 0 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Piston, compressor, compressed-air supply system, vehicle, and method for operating a compressed-air supply system10 Mar 2026US 12,571,389 B2Zf Cv Systems Europe BV
- Reciprocating compressor with a pressure-drop chamber and method23 Dec 2025US 12,504,009 B2Nuovo Pignone Tecnologie Srl
- Reconfigurable multi-stage gas compressor9 Dec 2025US 12,492,695 B2Flowco MasterCo LLC
- Balanced piston pump for subsea use21 Oct 2025US 12,448,097 B2Y&R Allum Pty Ltd
- Reciprocating compressor12 Aug 2025US 12,385,475 B2Kobe Steel, Ltd.
- Fuel compressor20 Aug 2026US 2026/0243241 A1Phinia Delphi Luxembourg Sarl
- Piston in piston variable displacement hydraulic device30 Jul 2026US 2026/0218690 A1
- Reconfigurable multi-stage gas compressor8 Jan 2026US 2026/0009381 A1Flowco MasterCo LLC
- Piston in piston variable displacement hydraulic device12 Dec 2024US 2024/0410345 A1
- A reciprocating compressor with a pressure-drop chamber and method3 Oct 2024US 2024/0328411 A1Nuovo Pignone Tecnologie Srl
Most cited
By later US patents
- Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization134US 5,988,165 AInvacare Corporation · 1999
- Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization113US 6,302,107 B1Invacare Corporation · 2001
- High pressure compressor with controlled cooling during the compression phase97US 5,674,053 A1997
- High pressure compressor with internal, cooled compression92US 5,769,610 A1998
- Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage70US 6,805,122 B2Invacare Corporation · 2004