F04B 27/12
Having plural sets of cylinders or pistons
Official title: having plural sets of cylinders or pistons
F04B27/12 (Having plural sets of cylinders or pistons) appears on 98 US grants and 63 published applications in this corpus.
Search patents in F04B- Granted patents
- 98
- Published applications
- 63
- Assignees
- 54
- Inventors
- 218
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 6 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 7 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 1 | 0 |
| 1993 | 8 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 1 | 3 |
| 2011 | 1 | 0 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 1 | 7 |
| 2015 | 1 | 13 |
| 2016 | 3 | 3 |
| 2017 | 6 | 10 |
| 2018 | 5 | 7 |
| 2019 | 6 | 2 |
| 2020 | 4 | 5 |
| 2021 | 3 | 5 |
| 2022 | 3 | 0 |
| 2023 | 1 | 1 |
| 2024 | 2 | 2 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Multi-cylinder reciprocating compressor13 Jan 2026US 12,523,220 B2Officine Mario Dorin S.P.A.
- Variable-displacement swash plate type compressor1 Jul 2025US 12,345,246 B2Valeo Japan Co., Ltd.
- Refrigerant compressor with stator elastic support19 Nov 2024US 12,146,486 B2BITZER Kuehlmaschinenbau GmbH
- Electric drive compressor system9 Jan 2024US 11,867,163 B2Unicla International Limited
- Variable capacity swash plate type compressor16 May 2023US 11,649,811 B2Estra Automotive Systems Co., Ltd.
- Refrigerant compressor12 Dec 2024US 2024/0410360 A1BITZER Kuehlmaschinenbau GmbH
- Variable-displacement swash plate type compressor11 Jan 2024US 2024/0011480 A1Valeo Japan Co., Ltd.
- Multi-cylinder reciprocating compressor2 Feb 2023US 2023/0034730 A1Officine Mario Dorin S.P.A.
- Refrigerant compresssor30 Dec 2021US 2021/0404457 A1BITZER Kuehlmaschinenbau GmbH
- Variable Displacement Compressor30 Sep 2021US 2021/0301802 A1Sanden Automotive Components Corporation
Most cited
By later US patents
- Wind powered fluid compressor62US 4,008,006 A1977
- Air bedding system with diaphragm pump62US 5,606,756 APrice Manufacturing, Inc. · 1997
- Swash plate type compressor with swash plate hinge coupling mechanism45US 5,259,736 ASanden Corporation · 1993
- Continuously variable capacity swash plate type refrigerant compressor38US 5,032,060 AKabushiki Kaisha Toyoda Jidoshokki Seisakusho · 1991
- Air bed diaphragm pump38US 5,588,811 APrice Manufacturing, Inc. · 1996