F16D 2025/081
Hydraulic devices that initiate movement of pistons in secondary cylinders for actuating
Official title: {Hydraulic devices that initiate movement of pistons in secondary cylinders for actuating clutches, i.e. primary cylinders}
F16D2025/081 (Hydraulic devices that initiate movement of pistons in secondary cylinders for actuating) appears on 152 US grants and 98 published applications in this corpus.
Search patents in F16D- Granted patents
- 152
- Published applications
- 98
- Assignees
- 68
- Inventors
- 250
- Latest grant
- 9 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 7 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 4 | 0 |
| 2000 | 1 | 0 |
| 2001 | 4 | 3 |
| 2002 | 9 | 6 |
| 2003 | 8 | 6 |
| 2004 | 4 | 6 |
| 2005 | 5 | 12 |
| 2006 | 5 | 6 |
| 2007 | 7 | 1 |
| 2008 | 3 | 3 |
| 2009 | 0 | 1 |
| 2010 | 3 | 1 |
| 2011 | 3 | 1 |
| 2012 | 2 | 4 |
| 2013 | 2 | 1 |
| 2014 | 2 | 3 |
| 2015 | 1 | 4 |
| 2016 | 5 | 6 |
| 2017 | 4 | 7 |
| 2018 | 3 | 7 |
| 2019 | 5 | 4 |
| 2020 | 9 | 5 |
| 2021 | 3 | 3 |
| 2022 | 1 | 2 |
| 2023 | 2 | 5 |
| 2024 | 6 | 1 |
| 2025 | 4 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Built-in magnetic filter module and clutch separation system9 Dec 2025US 12,491,521 B2Schaeffler Technologies AG & Co. KG
- Clutch actuator, detection system and method for detecting an angular position of a rotary component17 Jun 2025US 12,332,087 B2Schaeffler Technologies AG & Co. KG
- Hydraulic transmission unit for an actuator25 Mar 2025US 12,258,983 B2MetisMotion GmbH
- Hydraulic fitting25 Feb 2025US 12,233,826 B2RIVA GmbH Engineering
- Clutch actuator, sensing system and method for sensing an angular position of a rotational component31 Dec 2024US 12,181,311 B2Schaeffler Technologies AG & Co. KG
- Hydraulic fitting3 Oct 2024US 2024/0326765 A1Fahrwerker GmbH
- Clutch assist device16 Nov 2023US 2023/0365218 A1
- Built-in magnetic filter module and clutch separation system5 Oct 2023US 2023/0313845 A1Schaffler Technologies AG & Co. KG
- Clutch actuator, sensing system and method for sensing an angular position of a rotational component16 Mar 2023US 2023/0079776 A1Schaeffler Technologies AG & Co. KG
- Clutch actuator, detection system and method for detecting an angular position of a rotary component2 Mar 2023US 2023/0069443 A1Schaeffler Technologies AG & Co. KG
Most cited
By later US patents
- Hydraulic master cylinder and reservoir assembly66US 5,477,682 AAutomotive Products France, SA · 1995
- Arrangement for fixing a tubular element on a structural element of a motor vehicle body64US 6,322,284 B1Valeo · 2001
- Liquid pressure apparatus57US 4,407,125 AAutomotive Products plc · 1983
- Quick connect cylinder mount structure39US 4,640,478 AAutomotive Products plc · 1987
- Modular prefilled hydraulic control apparatus36US 5,018,352 AAutomotive Products plc · 1991