F04B 39/125
Cylinder heads
Official title: {Cylinder heads}
F04B39/125 (Cylinder heads) appears on 274 US grants and 342 published applications in this corpus.
Search patents in F04B- Granted patents
- 274
- Published applications
- 342
- Assignees
- 181
- Inventors
- 694
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 5 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 6 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 2 |
| 2002 | 8 | 6 |
| 2003 | 11 | 11 |
| 2004 | 4 | 19 |
| 2005 | 8 | 13 |
| 2006 | 6 | 9 |
| 2007 | 6 | 9 |
| 2008 | 2 | 13 |
| 2009 | 1 | 15 |
| 2010 | 0 | 6 |
| 2011 | 5 | 6 |
| 2012 | 6 | 7 |
| 2013 | 6 | 8 |
| 2014 | 3 | 14 |
| 2015 | 6 | 8 |
| 2016 | 7 | 20 |
| 2017 | 10 | 26 |
| 2018 | 15 | 15 |
| 2019 | 17 | 24 |
| 2020 | 20 | 6 |
| 2021 | 17 | 27 |
| 2022 | 17 | 20 |
| 2023 | 12 | 16 |
| 2024 | 13 | 11 |
| 2025 | 15 | 21 |
| 2026 | 14 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Air compressor structure8 Sep 2026US 12,729,671 B2Unik World Industrial Co., Ltd.
- Cylinder assembly and compressor having the same25 Aug 2026US 12,716,408 B2Anhui Meizhi Compressor Co., Ltd.
- Sound reduction device for rocking piston compressors4 Aug 2026US 12,698,765 B2Gast Manufacturing, Inc.
- Air compressor for a vehicle air braking system28 Jul 2026US 12,692,853 B2KB Intellectual Property GmbH & Co. KG
- Pump manifold with redundancy for gas extraction system12 May 2026US 12,624,687 B2ABB Schweiz AG
- Fuel compressor20 Aug 2026US 2026/0243241 A1Phinia Delphi Luxembourg Sarl
- Air compressor cylinder16 Jul 2026US 2026/0201879 A1Mastery Investment LLC
- Hydraulic end of fracturing pump4 Jun 2026US 2026/0153082 A1Yantai Jereh Oilfield Services Group Co., Ltd.
- Hydraulic end of fracturing pump4 Jun 2026US 2026/0153083 A1Yantai Jereh Oilfield Services Group Co., Ltd.
- Hydraulic end of fracturing pump14 May 2026US 2026/0132783 A1Yantai Jereh Oilfield Services Group Co., Ltd.
Most cited
By later US patents
- Fluid end of a high pressure plunger pump105US 9,732,746 B2Gardner-Denver Company · 2017
- Method and equipment for improving the efficiency of compressors and refrigerators94US 10,961,995 B22021
- Compressed air control apparatus63US 5,600,953 AAisin Seiki Kabushiki Kaisha · 1997
- Muffler for compressor and compressor having the same60US RE47,930 E1LG Electronics Inc. · 2020
- System and method for providing oxygen47US 8,062,003 B2Invacare Corporation · 2011