F04B 27/1804
Controlled by crankcase pressure
Official title: {Controlled by crankcase pressure}
F04B27/1804 (Controlled by crankcase pressure) appears on 657 US grants and 476 published applications in this corpus.
Search patents in F04B- Granted patents
- 657
- Published applications
- 476
- Assignees
- 101
- Inventors
- 615
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 4 | 0 |
| 1987 | 7 | 0 |
| 1988 | 13 | 0 |
| 1989 | 26 | 0 |
| 1990 | 15 | 0 |
| 1991 | 23 | 0 |
| 1992 | 15 | 0 |
| 1993 | 9 | 0 |
| 1994 | 10 | 0 |
| 1995 | 4 | 0 |
| 1996 | 12 | 0 |
| 1997 | 12 | 0 |
| 1998 | 13 | 0 |
| 1999 | 14 | 0 |
| 2000 | 36 | 0 |
| 2001 | 41 | 19 |
| 2002 | 45 | 30 |
| 2003 | 39 | 36 |
| 2004 | 26 | 31 |
| 2005 | 11 | 26 |
| 2006 | 15 | 22 |
| 2007 | 9 | 19 |
| 2008 | 8 | 18 |
| 2009 | 8 | 23 |
| 2010 | 11 | 12 |
| 2011 | 7 | 10 |
| 2012 | 10 | 10 |
| 2013 | 11 | 6 |
| 2014 | 7 | 21 |
| 2015 | 10 | 43 |
| 2016 | 18 | 11 |
| 2017 | 27 | 19 |
| 2018 | 15 | 10 |
| 2019 | 5 | 20 |
| 2020 | 19 | 28 |
| 2021 | 12 | 25 |
| 2022 | 28 | 20 |
| 2023 | 16 | 13 |
| 2024 | 20 | 3 |
| 2025 | 9 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Pressure actuated diaphragm pump21 Apr 2026US 12,607,181 B2
- Variable displacement swash plate type compressor and control method16 Sep 2025US 12,416,302 B2Hanon Systems
- Valve26 Aug 2025US 12,398,822 B2Eagle Industry Co., Ltd.
- Variable-displacement swash plate type compressor1 Jul 2025US 12,345,246 B2Valeo Japan Co., Ltd.
- Fluid control valve13 May 2025US 12,297,913 B2Eagle Industry Co., Ltd.
- Pressure actuated diaphragm pump20 Feb 2025US 2025/0059966 A1Maruyama Mfg.Co., Inc.
- Variable displacement swash plate type compressor control method and variable displacement swash plate type compressor controlled thereby29 Feb 2024US 2024/0068460 A1Hanon Systems
- Variable-displacement swash plate type compressor11 Jan 2024US 2024/0011480 A1Valeo Japan Co., Ltd.
- Valve11 Jan 2024US 2024/0011574 A1Eagle Industry Co., Ltd.
- Valve14 Dec 2023US 2023/0400104 A1Eagle Industry Co., Ltd.
Most cited
By later US patents
- Variable displacement compressor control valve arrangement87US 4,428,718 AGeneral Motors Corporation · 1984
- Control system for variable displacement compressor85US 4,037,993 ABorg-Warner Corporation · 1977
- Solenoid pressure transducer78US 6,116,269 AFasco Controls Corporation · 2000
- Control valve unit with independently operable valve mechanisms for variable displacement compressor77US 6,010,312 AKabushiki Kaisha Toyoda Jidoshokki Seiksakusho · 2000
- Variable stroke compressor74US 4,061,443 AGeneral Motors Corporation · 1977