F15B 2211/635
Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
F15B2211/635 (Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements) appears on 642 US grants and 476 published applications in this corpus.
Search patents in F15B- Granted patents
- 642
- Published applications
- 476
- Assignees
- 234
- Inventors
- 1,083
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 12 | 0 |
| 1978 | 8 | 0 |
| 1979 | 4 | 0 |
| 1980 | 7 | 0 |
| 1981 | 7 | 0 |
| 1982 | 9 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 7 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 7 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 13 | 0 |
| 1992 | 7 | 0 |
| 1993 | 9 | 0 |
| 1994 | 10 | 0 |
| 1995 | 9 | 0 |
| 1996 | 7 | 0 |
| 1997 | 6 | 0 |
| 1998 | 9 | 0 |
| 1999 | 13 | 0 |
| 2000 | 13 | 0 |
| 2001 | 16 | 3 |
| 2002 | 14 | 11 |
| 2003 | 15 | 23 |
| 2004 | 19 | 11 |
| 2005 | 12 | 11 |
| 2006 | 7 | 8 |
| 2007 | 6 | 6 |
| 2008 | 5 | 7 |
| 2009 | 8 | 14 |
| 2010 | 8 | 7 |
| 2011 | 5 | 8 |
| 2012 | 3 | 7 |
| 2013 | 10 | 12 |
| 2014 | 9 | 13 |
| 2015 | 9 | 22 |
| 2016 | 12 | 16 |
| 2017 | 18 | 24 |
| 2018 | 14 | 26 |
| 2019 | 25 | 27 |
| 2020 | 33 | 41 |
| 2021 | 36 | 34 |
| 2022 | 39 | 43 |
| 2023 | 34 | 33 |
| 2024 | 32 | 29 |
| 2025 | 32 | 26 |
| 2026 | 21 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hydraulic system for work machine, and work machine15 Sep 2026US RE51,031 E1Kubota Corporation
- Hydraulic braking energy utilization for emergency steering, braking, charging accumulator(s), and/or work functions to reduce or prevent engine from overspeed, assist acceleration and/or unlimited towing21 Jul 2026US 12,687,181 B2Applied Industrial Technologies, Inc.
- Electro-hydraulic actuator with a pilot-actuated float mode16 Jun 2026US 12,655,918 B2Parker-Hannifin Corporation
- Hydraulic machine swing system with anti-drift9 Jun 2026US 12,650,003 B2Caterpillar Inc.
- Pneumohydraulic pressure intensifier12 May 2026US 12,624,710 B2WS Wieländer + Schill Engineering GmbH & Co. KG
- Hauling Vehicle27 Aug 2026US 2026/0249901 A1Hitachi Construction Machinery Co., Ltd.
- Transport vehicle20 Aug 2026US 2026/0241846 A1Hitachi Construction Machinery Co., Ltd.
- Work Machine13 Aug 2026US 2026/0234907 A1Hitachi Construction Machinery Co., Ltd.
- Three servovalve thrust reverser actuator system23 Jul 2026US 2026/0210311 A1
- Work Machine2 Apr 2026US 2026/0092431 A1Hitachi Construction Machinery Co., Ltd.
Most cited
By later US patents
- Hydraulic control system for downhole tools100US 6,536,530 B2Halliburton Energy Services.Inc. · 2003
- Pneumatic-hydraulic actuator system74US 4,335,867 A1982
- Control system for load-sensing hydraulic drive circuit65US 4,967,557 AHitachi Construction Machinery Co., Ltd. · 1990
- Control system for automatically controlling actuators of an excavator57US 5,361,211 ASamsung Heavy Industries Co., Ltd. · 1994
- Hydraulic circuit utilizing a compensator pressure selecting value51US 5,209,063 AKabushiki Kaisha Komatsu Seisakusho · 1993