F15B 2211/6052
Using check valves
Official title: using check valves
F15B2211/6052 (Using check valves) appears on 130 US grants and 60 published applications in this corpus.
Search patents in F15B- Granted patents
- 130
- Published applications
- 60
- Assignees
- 67
- Inventors
- 195
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 7 | 0 |
| 1978 | 7 | 0 |
| 1979 | 7 | 0 |
| 1980 | 5 | 0 |
| 1981 | 5 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 5 | 2 |
| 2003 | 3 | 3 |
| 2004 | 2 | 2 |
| 2005 | 2 | 5 |
| 2006 | 1 | 3 |
| 2007 | 4 | 3 |
| 2008 | 3 | 3 |
| 2009 | 3 | 0 |
| 2010 | 0 | 5 |
| 2011 | 0 | 0 |
| 2012 | 0 | 3 |
| 2013 | 1 | 1 |
| 2014 | 2 | 3 |
| 2015 | 1 | 2 |
| 2016 | 3 | 1 |
| 2017 | 2 | 1 |
| 2018 | 3 | 1 |
| 2019 | 1 | 3 |
| 2020 | 4 | 7 |
| 2021 | 4 | 0 |
| 2022 | 1 | 1 |
| 2023 | 3 | 2 |
| 2024 | 0 | 1 |
| 2025 | 4 | 5 |
| 2026 | 5 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Control method based on a four-chamber hydraulic cylinder6 Oct 2026US 12,753,780 B2Taiyuan University of Technology
- Hydraulic drive apparatus21 Jul 2026US 12,687,182 B2Kawasaki Jukogyo Kabushiki Kaisha
- Volume follow supply9 Jun 2026US 12,650,135 B2Hydac Fluidtechnik GmbH
- Variable relief circuit19 May 2026US 12,631,201 B2HUSCO International, Inc.
- Floating control system for fixed displacement pump system24 Feb 2026US 12,560,183 B2Hunan Sinoboom Intelligent Equipment Co., Ltd.
- Open and closed circuit parallel drive system and control method based on a four-chamber hydraulic cylinder19 Feb 2026US 2026/0049622 A1Taiyuan University of Technology
- Hydraulic drive apparatus22 Jan 2026US 2026/0022713 A1Kawasaki Jukogyo Kabushiki Kaisha
- Hydraulic drive apparatus1 Jan 2026US 2026/0002342 A1
- Volume Follow Supply4 Dec 2025US 2025/0369458 A1Hydac Fluidtechnik GmbH
- Hydraulic System19 Jun 2025US 2025/0198429 A1Kubota Corporation
Most cited
By later US patents
- Fluid power distribution and control system111US 10,161,423 B2Sauer-Danfoss ApS · 2018
- Pilot solenoid control valve and hydraulic control system using same49US 5,878,647 AHUSCO International, Inc. · 1999
- Method of controlling speed change of hydraulic drive device for vehicle and speed change device47US 5,784,883 AKomatsu Ltd. · 1998
- Fast response load sense control system41US 4,986,071 AKomatsu Dresser Company · 1991
- Load responsive fluid control valve30US 4,222,409 A1980