F04B 27/00
Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or
Official title: Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders (multi-stage pumps specially adapted for elastic fluids F04B25/00)
F04B27/00 (Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or) appears on 2,245 US grants and 1,871 published applications in this corpus.
Search patents in F04B- Granted patents
- 2,245
- Published applications
- 1,871
- Assignees
- 578
- Inventors
- 2,757
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 16 | 0 |
| 1978 | 15 | 0 |
| 1979 | 13 | 0 |
| 1980 | 10 | 0 |
| 1981 | 16 | 0 |
| 1982 | 13 | 0 |
| 1983 | 18 | 0 |
| 1984 | 13 | 0 |
| 1985 | 17 | 0 |
| 1986 | 14 | 0 |
| 1987 | 23 | 0 |
| 1988 | 39 | 0 |
| 1989 | 46 | 0 |
| 1990 | 31 | 0 |
| 1991 | 47 | 0 |
| 1992 | 35 | 0 |
| 1993 | 35 | 0 |
| 1994 | 30 | 0 |
| 1995 | 36 | 0 |
| 1996 | 40 | 0 |
| 1997 | 41 | 0 |
| 1998 | 53 | 0 |
| 1999 | 63 | 0 |
| 2000 | 95 | 0 |
| 2001 | 106 | 68 |
| 2002 | 134 | 136 |
| 2003 | 129 | 128 |
| 2004 | 84 | 122 |
| 2005 | 54 | 112 |
| 2006 | 53 | 84 |
| 2007 | 42 | 69 |
| 2008 | 41 | 79 |
| 2009 | 24 | 79 |
| 2010 | 38 | 72 |
| 2011 | 31 | 53 |
| 2012 | 42 | 41 |
| 2013 | 41 | 65 |
| 2014 | 39 | 74 |
| 2015 | 46 | 106 |
| 2016 | 50 | 69 |
| 2017 | 78 | 69 |
| 2018 | 58 | 68 |
| 2019 | 50 | 63 |
| 2020 | 65 | 64 |
| 2021 | 57 | 76 |
| 2022 | 54 | 46 |
| 2023 | 48 | 47 |
| 2024 | 50 | 26 |
| 2025 | 34 | 33 |
| 2026 | 26 | 22 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F04B 27/08Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or1,873
- F04B 27/04Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or214
- F04B 27/02Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or122
- F04B 27/005Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or109
- F04B 27/24Control not provided for in a single group of groups f04b27/02 -18
Recent patents
- Multi-phase fluid pump system with driving fluid and pump fluid cylinders and buffer chambers22 Sep 2026US 12,742,449 B2I-Jack Technologies Incorporated
- Transmission structure with limiting rail and air compressor15 Sep 2026US 12,736,040 B2Zhejiang Qianji Intelligent Technology Co., Ltd.
- Rotary multi-cylinder gas compressor25 Aug 2026US 12,716,406 B1
- Reciprocating piston pump18 Aug 2026US 12,710,033 B1Oshkosh Corporation
- Sound reduction device for rocking piston compressors4 Aug 2026US 12,698,765 B2Gast Manufacturing, Inc.
- Piston-cylinder assembly for a radial piston compressor, and radial piston compressor24 Sep 2026US 2026/0286945 A1thyssenkrupp AG
- Piston pump with pistons, crank rods, and ball joints17 Sep 2026US 2026/0275975 A1Lear Corporation
- Reed valve assembly for a radial piston compressor, radial piston compressor, and method for mounting a reed valve assembly on a radial piston compressor10 Sep 2026US 2026/0266275 A1thyssenkrupp AG
- Radial piston compressor10 Sep 2026US 2026/0266276 A1thyssenkrupp AG
- Compressor10 Sep 2026US 2026/0266277 A1Sanden Corporation
Most cited
By later US patents
- Reciprocating pistons of piston-type compressor121US 6,038,960 ASanden Corporation · 2000
- Piston type compressor with improved suction reed valve stopper116US 4,749,340 AKabushiki Kaisha Toyoda Jidoshokki Seisakusho · 1988
- Piston mounting and balancing system115US 6,832,900 B2Thomas Industries, Inc. · 2004
- Refrigerant compressor apparatus111US 6,401,472 B2BITZER Kuehlmaschinenbau GmbH · 2002
- Gas compressor construction and assembly109US 5,326,231 ABristol Compressors, Inc. · 1994