F15B 13/0426
With fluid-operated pilot valves, i.e. multiple stage valves
Official title: {with fluid-operated pilot valves, i.e. multiple stage valves}
F15B13/0426 (With fluid-operated pilot valves, i.e. multiple stage valves) appears on 102 US grants and 101 published applications in this corpus.
Search patents in F15B- Granted patents
- 102
- Published applications
- 101
- Assignees
- 79
- Inventors
- 202
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 1 |
| 2002 | 2 | 1 |
| 2003 | 2 | 2 |
| 2004 | 3 | 1 |
| 2005 | 2 | 2 |
| 2006 | 0 | 1 |
| 2007 | 1 | 2 |
| 2008 | 1 | 3 |
| 2009 | 0 | 2 |
| 2010 | 3 | 1 |
| 2011 | 2 | 2 |
| 2012 | 2 | 6 |
| 2013 | 2 | 3 |
| 2014 | 1 | 6 |
| 2015 | 7 | 12 |
| 2016 | 6 | 3 |
| 2017 | 6 | 11 |
| 2018 | 6 | 8 |
| 2019 | 12 | 7 |
| 2020 | 16 | 12 |
| 2021 | 10 | 3 |
| 2022 | 4 | 3 |
| 2023 | 1 | 2 |
| 2024 | 1 | 2 |
| 2025 | 5 | 3 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hydraulic system for work machine, and work machine15 Sep 2026US RE51,031 E1Kubota Corporation
- Pneumohydraulic pressure intensifier12 May 2026US 12,624,710 B2WS Wieländer + Schill Engineering GmbH & Co. KG
- Hydraulic system for a brake release device, brake release device with such a hydraulic system and brake system30 Dec 2025US 12,509,042 B2HAWE Hydraulik SE
- Fluid circuit for intermittent air discharge18 Nov 2025US 12,473,932 B2SMC Corporation
- Pilot pressure control device30 Sep 2025US 12,429,071 B2Caterpillar SARL
- Control of a free-wheeling valve2 Apr 2026US 2026/0092646 A1
- Pneumohydraulic pressure intensifier22 Jan 2026US 2026/0022711 A1WS Wieländer + Schill Engineering GmbH & Co. KG
- Tank system and valve arrangement15 May 2025US 2025/0154966 A1Leinemann GmbH & Co. KG
- Flow control valve24 Apr 2025US 2025/0129573 A1Hitachi Construction Machinery Co., Ltd.
- Pilot pressure control device23 Jan 2025US 2025/0027516 A1Caterpillar SARL
Most cited
By later US patents
- High pressure hydraulic system38US 4,250,794 ACaterpillar Tractor Co. · 1981
- Hydraulic drive system and improved control valve assembly therefor37US 6,971,232 B2Eaton Corporation · 2005
- Electromagnetic pilot type valve33US 4,201,362 AKabushiki Kaisha Saginomiya Seisakusho · 1980
- Wireless, intrinsically safe valve22US 6,685,159 B1Ross Operating Valve Company · 2004
- System for accelerating relief valve opening17US 8,413,677 B1Expro Americas, LLC · 2013