F04B 27/04
Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or
Official title: having cylinders in star- or fan-arrangement
F04B27/04 (Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or) appears on 214 US grants and 264 published applications in this corpus.
Search patents in F04B- Granted patents
- 214
- Published applications
- 264
- Assignees
- 170
- Inventors
- 552
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 0 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 2 |
| 2002 | 5 | 2 |
| 2003 | 5 | 4 |
| 2004 | 6 | 3 |
| 2005 | 1 | 8 |
| 2006 | 1 | 7 |
| 2007 | 3 | 5 |
| 2008 | 4 | 9 |
| 2009 | 2 | 5 |
| 2010 | 2 | 13 |
| 2011 | 2 | 9 |
| 2012 | 4 | 10 |
| 2013 | 8 | 13 |
| 2014 | 5 | 13 |
| 2015 | 6 | 11 |
| 2016 | 6 | 12 |
| 2017 | 9 | 13 |
| 2018 | 7 | 18 |
| 2019 | 14 | 11 |
| 2020 | 16 | 10 |
| 2021 | 19 | 19 |
| 2022 | 6 | 13 |
| 2023 | 12 | 18 |
| 2024 | 11 | 11 |
| 2025 | 8 | 13 |
| 2026 | 12 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Rotary multi-cylinder gas compressor25 Aug 2026US 12,716,406 B1
- Reciprocating piston pump18 Aug 2026US 12,710,033 B1Oshkosh Corporation
- Radial piston compressor with transmission element and piston guide ring28 Jul 2026US 12,692,849 B2thyssenkrupp AG
- Radial piston pump with housing and cover arrangement9 Jun 2026US 12,650,116 B2thyssenkrupp AG
- Head module for air compressor and air compressor including same2 Jun 2026US 12,644,446 B2MDX Co., Ltd.
- 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
- Radial piston compressor23 Jul 2026US 2026/0210344 A1thyssenkrupp AG
Most cited
By later US patents
- Piston mounting and balancing system115US 6,832,900 B2Thomas Industries, Inc. · 2004
- Refrigerant compressor apparatus111US 6,401,472 B2BITZER Kuehlmaschinenbau GmbH · 2002
- Direct crankshaft of air compressor95US 8,388,317 B2Kohands. Co., Ltd · 2013
- Method and equipment for improving the efficiency of compressors and refrigerators94US 10,961,995 B22021
- Compressor valve health monitor71US 9,759,213 B2Computational Systems, Inc. · 2017