F15B 2211/30525
Directional control valves
Official title: Directional control valves, e.g. 4/3-directional control valve
F15B2211/30525 (Directional control valves) appears on 1,156 US grants and 695 published applications in this corpus.
Search patents in F15B- Granted patents
- 1,156
- Published applications
- 695
- Assignees
- 432
- Inventors
- 1,723
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 29 | 0 |
| 1977 | 21 | 0 |
| 1978 | 19 | 0 |
| 1979 | 21 | 0 |
| 1980 | 20 | 0 |
| 1981 | 14 | 0 |
| 1982 | 20 | 0 |
| 1983 | 16 | 0 |
| 1984 | 13 | 0 |
| 1985 | 12 | 0 |
| 1986 | 13 | 0 |
| 1987 | 15 | 0 |
| 1988 | 16 | 0 |
| 1989 | 8 | 0 |
| 1990 | 13 | 0 |
| 1991 | 23 | 0 |
| 1992 | 25 | 0 |
| 1993 | 21 | 0 |
| 1994 | 25 | 0 |
| 1995 | 20 | 0 |
| 1996 | 16 | 0 |
| 1997 | 17 | 0 |
| 1998 | 37 | 0 |
| 1999 | 26 | 0 |
| 2000 | 23 | 0 |
| 2001 | 49 | 5 |
| 2002 | 33 | 29 |
| 2003 | 27 | 45 |
| 2004 | 34 | 34 |
| 2005 | 33 | 38 |
| 2006 | 26 | 40 |
| 2007 | 25 | 28 |
| 2008 | 24 | 28 |
| 2009 | 19 | 31 |
| 2010 | 18 | 21 |
| 2011 | 22 | 12 |
| 2012 | 8 | 10 |
| 2013 | 17 | 15 |
| 2014 | 14 | 15 |
| 2015 | 12 | 32 |
| 2016 | 14 | 21 |
| 2017 | 25 | 30 |
| 2018 | 23 | 41 |
| 2019 | 38 | 33 |
| 2020 | 48 | 34 |
| 2021 | 31 | 39 |
| 2022 | 37 | 21 |
| 2023 | 23 | 26 |
| 2024 | 16 | 32 |
| 2025 | 31 | 24 |
| 2026 | 26 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Control method based on a four-chamber hydraulic cylinder6 Oct 2026US 12,753,780 B2Taiyuan University of Technology
- Valve section and hydraulic valve assembly22 Sep 2026US 12,742,463 B2HAWE Hydraulik SE
- Hybrid electro-hydraulic load sensing system and control method thereof15 Sep 2026US 12,736,067 B2Chongqing University
- Hydraulic power steering system25 Aug 2026US 12,715,501 B2Hydac New Technologies GmbH
- Hydraulic distributor with pressure compensator for directional valves18 Aug 2026US 12,710,062 B2Walvoil S.P.A.
- Hydraulic Isolation Cylinder-Based System6 Aug 2026US 2026/0226921 A1SRI Energy, Inc.
- Bulldozing hydraulic system with bulldozing blade floating function and excavator11 Jun 2026US 2026/0160045 A1Xuzhou XCMG Excavator Machinery Co., Ltd.
- Asphalt finisher4 Jun 2026US 2026/0152905 A1Sumitomo Construction Machinery Co., Ltd.
- Pressure compensation valve and hydraulic control system28 May 2026US 2026/0145919 A1Zhejiang Senstren Technology Co., LTD
- Switching device with push button and water outlet device16 Apr 2026US 2026/0104102 A1Xiamen Miqi Technology Co., Ltd
Most cited
By later US patents
- Pneumatically operated mechanism1,103US 6,050,172 AEmhart Glass S. A. · 2000
- Hydraulic circuit for automatic transmission1,004US 9,488,197 B2Hyundai Motor Company · 2016
- Force-controlled hydro-elastic actuator139US 6,494,039 B2Massachusetts Institute of Technology · 2002
- Hydraulic system providing down force on a work implement109US 6,460,623 B1Caterpillar Inc. · 2002
- Cartridge valve having solenoid bypass and integral relief valve94US 5,992,450 AEaton Corporation · 1999