F15B 11/15
With special provision for automatic return
Official title: with special provision for automatic return
F15B11/15 (With special provision for automatic return) appears on 48 US grants and 34 published applications in this corpus.
Search patents in F15B- Granted patents
- 48
- Published applications
- 34
- Assignees
- 40
- Inventors
- 81
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 4 |
| 2003 | 3 | 2 |
| 2004 | 4 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 0 |
| 2007 | 2 | 2 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 2 | 1 |
| 2011 | 1 | 0 |
| 2012 | 0 | 1 |
| 2013 | 1 | 2 |
| 2014 | 1 | 2 |
| 2015 | 1 | 2 |
| 2016 | 1 | 2 |
| 2017 | 2 | 1 |
| 2018 | 1 | 3 |
| 2019 | 3 | 1 |
| 2020 | 1 | 1 |
| 2021 | 2 | 1 |
| 2022 | 0 | 1 |
| 2023 | 3 | 0 |
| 2024 | 1 | 2 |
| 2025 | 1 | 1 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Pneumohydraulic pressure intensifier12 May 2026US 12,624,710 B2WS Wieländer + Schill Engineering GmbH & Co. KG
- Valves for controlling flow of pressurized fluid to a tool5 May 2026US 12,618,485 B2Enerpac Tool Group Corp.
- Hydraulic valve assembly11 Nov 2025US 12,467,481 B2HAWE Hydraulik SE
- Automatic oil return structure for piston pump9 Apr 2024US 11,953,029 B2Kudos Mechanical Co., Ltd.
- Automatic oil return structure for piston pump19 Sep 2023US 11,759,937 B1Kudos Mechanical Co., Ltd.
- Pneumohydraulic pressure intensifier22 Jan 2026US 2026/0022711 A1WS Wieländer + Schill Engineering GmbH & Co. KG
- Valves for controlling flow of pressurized fluid to a tool10 Jul 2025US 2025/0224042 A1Enerpac Tool Group Corp.
- Automatic oil return structure for piston pump29 Feb 2024US 2024/0068491 A1Kudos Mechanical Co., Ltd.
- Hydraulic valve assembly8 Feb 2024US 2024/0044344 A1HAWE Hydraulik SE
- Valve structure for driving reversible ploughs26 May 2022US 2022/0163055 A1Oleodinamica Marchesini S.p.A.
Most cited
By later US patents
- Hydraulic control system17US 4,129,987 AGresen Manufacturing Company · 1978
- Hydraulic drive system and method of operating a hydraulic drive system13US 7,739,941 B2Westport Power Inc. · 2010
- Valve cap for pneumatic nailer11US 8,579,175 B2Illinois Tool Works Inc. · 2013
- Hydraulic unit10US 6,095,028 AKvaerner Pulping AB · 2000
- Pneumatic oil pump7US 6,415,704 B12002