F15B 2211/3116
The pump port being open in the centre position
Official title: the pump port being open in the centre position, e.g. so-called open centre
F15B2211/3116 (The pump port being open in the centre position) appears on 462 US grants and 360 published applications in this corpus.
Search patents in F15B- Granted patents
- 462
- Published applications
- 360
- Assignees
- 147
- Inventors
- 750
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 3 | 0 |
| 1978 | 11 | 0 |
| 1979 | 8 | 0 |
| 1980 | 6 | 0 |
| 1981 | 4 | 0 |
| 1982 | 7 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 6 | 0 |
| 1986 | 2 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 9 | 0 |
| 1997 | 6 | 0 |
| 1998 | 5 | 0 |
| 1999 | 8 | 0 |
| 2000 | 7 | 0 |
| 2001 | 12 | 3 |
| 2002 | 8 | 6 |
| 2003 | 9 | 15 |
| 2004 | 10 | 13 |
| 2005 | 12 | 15 |
| 2006 | 12 | 13 |
| 2007 | 11 | 14 |
| 2008 | 5 | 10 |
| 2009 | 12 | 11 |
| 2010 | 6 | 12 |
| 2011 | 6 | 11 |
| 2012 | 9 | 17 |
| 2013 | 16 | 17 |
| 2014 | 13 | 17 |
| 2015 | 13 | 8 |
| 2016 | 16 | 7 |
| 2017 | 10 | 8 |
| 2018 | 9 | 25 |
| 2019 | 21 | 25 |
| 2020 | 17 | 12 |
| 2021 | 21 | 22 |
| 2022 | 18 | 31 |
| 2023 | 24 | 16 |
| 2024 | 14 | 15 |
| 2025 | 20 | 12 |
| 2026 | 8 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Fluid motor control system providing speed change by combination of displacement and flow control69US 4,354,420 ACaterpillar Tractor Co. · 1982
- Hydraulic control circuit in a hydraulic excavator52US 5,970,709 AKabushiki Kaisha Kobe Seiko Sho · 1999
- Fluid control system for power shovel46US 5,083,428 AKabushiki Kaisha Kobe Seiko Sho · 1992
- Control device for hydraulically-operated equipment42US 6,308,516 B1Komatsu Ltd. · 2001
- High pressure hydraulic system38US 4,250,794 ACaterpillar Tractor Co. · 1981