F15B 15/224
Having a piston which closes off fluid outlets in the cylinder bore
Official title: {having a piston which closes off fluid outlets in the cylinder bore by its own movement}
F15B15/224 (Having a piston which closes off fluid outlets in the cylinder bore) appears on 50 US grants and 28 published applications in this corpus.
Search patents in F15B- Granted patents
- 50
- Published applications
- 28
- Assignees
- 40
- Inventors
- 85
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 3 |
| 2002 | 5 | 1 |
| 2003 | 1 | 2 |
| 2004 | 2 | 2 |
| 2005 | 3 | 2 |
| 2006 | 1 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 0 | 0 |
| 2015 | 0 | 4 |
| 2016 | 2 | 1 |
| 2017 | 0 | 0 |
| 2018 | 3 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 3 |
| 2021 | 2 | 2 |
| 2022 | 2 | 1 |
| 2023 | 2 | 2 |
| 2024 | 3 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Single acting hydraulic cylinder with head end cushioning25 Aug 2026US 12,716,430 B2Wipro Enterprises Pvt Ltd
- Working cylinder with end position damping, and damping piston ring20 Aug 2024US 12,066,040 B2BüMach Engineering International B. V.
- Working cylinder with cushioned end-stroke9 Apr 2024US 11,953,033 B2Buemach Engineering International B. V.
- Landing gear system for an aircraft26 Mar 2024US 11,939,044 B2Airbus Operations GmbH
- Actuator for an aircraft landing gear assembly21 Nov 2023US 11,820,495 B2Airbus Operations GmbH
- Single acting hydraulic cylinder with head end cushioning5 Mar 2026US 2026/0063152 A1Wipro Enterprises Pvt Ltd
- Working cylinder with end position damping, and damping piston ring7 Dec 2023US 2023/0392617 A1BüMach Engineering International B. V.
- Working cylinder with cushioned end-stroke12 Jan 2023US 2023/0011362 A1Buemach Engineering International B. V.
- Landing gear system for an aircraft9 Jun 2022US 2022/0177118 A1Airbus Operations GmbH
- Actuator for an aircraft landing gear assembly23 Sep 2021US 2021/0291966 A1Airbus Operations GmbH
Most cited
By later US patents
- Fluid pressure motor45US 4,425,836 AGovernment Innovators, Inc. · 1984
- Multi-stage extendible and contractible shaft with shock absorption32US 3,973,468 A1976
- Hydraulic cartridge for improved motion control29US 4,257,499 A1981
- Cushion hydraulic cylinder28US 6,186,043 B1Deere & Company · 2001
- Method and device for braking the speed of movement of the piston of a plunger-cylinder device16US 4,210,064 AHydraudyne B.V. · 1980