F15B 2211/3105
Neutral or centre positions
F15B2211/3105 (Neutral or centre positions) appears on 910 US grants and 634 published applications in this corpus.
Search patents in F15B- Granted patents
- 910
- Published applications
- 634
- Assignees
- 273
- Inventors
- 1,362
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 20 | 0 |
| 1977 | 8 | 0 |
| 1978 | 16 | 0 |
| 1979 | 17 | 0 |
| 1980 | 10 | 0 |
| 1981 | 8 | 0 |
| 1982 | 11 | 0 |
| 1983 | 7 | 0 |
| 1984 | 4 | 0 |
| 1985 | 12 | 0 |
| 1986 | 9 | 0 |
| 1987 | 10 | 0 |
| 1988 | 7 | 0 |
| 1989 | 8 | 0 |
| 1990 | 7 | 0 |
| 1991 | 14 | 0 |
| 1992 | 12 | 0 |
| 1993 | 18 | 0 |
| 1994 | 15 | 0 |
| 1995 | 14 | 0 |
| 1996 | 17 | 0 |
| 1997 | 10 | 0 |
| 1998 | 18 | 0 |
| 1999 | 17 | 0 |
| 2000 | 16 | 0 |
| 2001 | 32 | 4 |
| 2002 | 29 | 19 |
| 2003 | 23 | 39 |
| 2004 | 25 | 32 |
| 2005 | 33 | 30 |
| 2006 | 19 | 26 |
| 2007 | 21 | 31 |
| 2008 | 18 | 25 |
| 2009 | 22 | 21 |
| 2010 | 19 | 21 |
| 2011 | 16 | 23 |
| 2012 | 14 | 26 |
| 2013 | 24 | 23 |
| 2014 | 21 | 21 |
| 2015 | 17 | 16 |
| 2016 | 18 | 14 |
| 2017 | 18 | 14 |
| 2018 | 17 | 33 |
| 2019 | 26 | 33 |
| 2020 | 26 | 28 |
| 2021 | 36 | 30 |
| 2022 | 29 | 37 |
| 2023 | 31 | 27 |
| 2024 | 24 | 31 |
| 2025 | 32 | 20 |
| 2026 | 15 | 10 |
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
- Hydraulic drive apparatus21 Jul 2026US 12,687,182 B2Kawasaki Jukogyo Kabushiki Kaisha
- Volume follow supply9 Jun 2026US 12,650,135 B2Hydac Fluidtechnik GmbH
- Hydraulic distributor with compensation device for directional valves5 May 2026US 12,618,422 B2Walvoil S.P.A.
- Automatic pressure release14 Apr 2026US 12,601,149 B2Caterpillar Work Tools B. V.
- Hauling Vehicle27 Aug 2026US 2026/0249901 A1Hitachi Construction Machinery Co., Ltd.
- Transport vehicle20 Aug 2026US 2026/0241846 A1Hitachi Construction Machinery Co., Ltd.
- Work machine25 Jun 2026US 2026/0176842 A1Sumitomo Construction Machinery Co., Ltd.
- Work Machine2 Apr 2026US 2026/0092431 A1Hitachi Construction Machinery 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
Most cited
By later US patents
- Hydraulic system providing down force on a work implement109US 6,460,623 B1Caterpillar Inc. · 2002
- Systems and methods for energy storage and recovery using compressed gas96US 7,832,207 B2SustainX, Inc. · 2010
- Hydraulic circuit with a return line metering valve and method of operation81US 6,467,264 B1HUSCO International, Inc. · 2002
- System and method for controlling an independent metering valve77US 5,960,695 ACaterpillar Inc. · 1999
- Systems and methods for energy storage and recovery using rapid isothermal gas expansion and compression73US 7,874,155 B2SustainX, Inc. · 2011