F15B 2211/761
Control of a negative load, i.e. of a load generating hydraulic energy
F15B2211/761 (Control of a negative load, i.e. of a load generating hydraulic energy) appears on 254 US grants and 242 published applications in this corpus.
Search patents in F15B- Granted patents
- 254
- Published applications
- 242
- Assignees
- 107
- Inventors
- 425
- Latest grant
- 3 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 7 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 1 |
| 2005 | 2 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 2 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 4 |
| 2011 | 2 | 8 |
| 2012 | 2 | 7 |
| 2013 | 6 | 20 |
| 2014 | 6 | 17 |
| 2015 | 11 | 20 |
| 2016 | 20 | 17 |
| 2017 | 20 | 17 |
| 2018 | 11 | 20 |
| 2019 | 22 | 16 |
| 2020 | 24 | 17 |
| 2021 | 17 | 23 |
| 2022 | 17 | 21 |
| 2023 | 21 | 12 |
| 2024 | 11 | 7 |
| 2025 | 10 | 6 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Work machine6 Aug 2026US 2026/0226927 A1Komatsu Ltd.
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- Dump truck23 Jul 2026US 2026/0208652 A1Komatsu Ltd.
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Most cited
By later US patents
- Balanced pilot operated check valve61US 8,262,058 B22012
- Velocity control of unbalanced hydraulic actuator subjected to over-center load conditions30US 9,234,532 B2Parker-Hannifin Corporation · 2016
- Method for controlling pressure in a hydraulic actuator25US 9,670,943 B2Parker-Hannifin Corporation · 2017
- Load sensing circuit of load compensated direction control valve23US 4,747,335 ACaterpillar Inc. · 1988
- Negative load control and energy utilizing system22US 5,152,142 ACaterpillar Inc. · 1992