F04B 25/005
Multi-stage pumps: with two cylinders
Official title: {with two cylinders}
F04B25/005 (Multi-stage pumps: with two cylinders) appears on 98 US grants and 124 published applications in this corpus.
Search patents in F04B- Granted patents
- 98
- Published applications
- 124
- Assignees
- 85
- Inventors
- 253
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 3 |
| 2003 | 4 | 1 |
| 2004 | 2 | 5 |
| 2005 | 0 | 2 |
| 2006 | 1 | 4 |
| 2007 | 1 | 2 |
| 2008 | 2 | 1 |
| 2009 | 3 | 6 |
| 2010 | 0 | 1 |
| 2011 | 1 | 4 |
| 2012 | 1 | 6 |
| 2013 | 3 | 6 |
| 2014 | 3 | 7 |
| 2015 | 4 | 6 |
| 2016 | 3 | 10 |
| 2017 | 4 | 5 |
| 2018 | 6 | 4 |
| 2019 | 6 | 10 |
| 2020 | 7 | 12 |
| 2021 | 10 | 11 |
| 2022 | 5 | 3 |
| 2023 | 6 | 4 |
| 2024 | 6 | 2 |
| 2025 | 3 | 6 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Double acting two stage piston type pump23 Jun 2026US 12,662,996 B2Zf Cv Systems Europe BV
- Reciprocating compressor12 Aug 2025US 12,385,475 B2Kobe Steel, Ltd.
- Air compressor12 Aug 2025US 12,385,476 B2
- Integrated air supply unit15 Apr 2025US 12,276,269 B2
- Piston compressor8 Oct 2024US 12,110,883 B2Atlas Copco Airpower, Naamloze Vennootschap
- Fuel compressor20 Aug 2026US 2026/0243241 A1Phinia Delphi Luxembourg Sarl
- Vapor recovery multi-stage common-rod hydraulic compressor16 Jul 2026US 2026/0201873 A1I-Jack Technologies Incorporated
- Oil-free air compressor and vehicle2 Jul 2026US 2026/0185513 A1Zhejiang Ruili Air Copressor Equipment Co., Ltd.
- Air compressor13 Nov 2025US 2025/0347270 A1
- Double acting two stage piston type pump24 Jul 2025US 2025/0237203 A1Zf Cv Systems Europe BV
Most cited
By later US patents
- Method and equipment for improving the efficiency of compressors and refrigerators94US 10,961,995 B22021
- Intelligent air compressor operation66US 6,390,779 B1Westinghouse Air Brake Technologies Corporation · 2002
- Expansible chamber pneumatic system53US 7,527,483 B12009
- Compressor for single or multi-stage operation45US 5,577,390 ACarrier Corporation · 1996
- Refrigeration system with dual cylinder compressor33US 5,600,961 AGeneral Electric Company · 1997