F15B 2211/30505
Non-return valves, i.e. check valves
F15B2211/30505 (Non-return valves, i.e. check valves) appears on 1,067 US grants and 755 published applications in this corpus.
Search patents in F15B- Granted patents
- 1,067
- Published applications
- 755
- Assignees
- 475
- Inventors
- 1,800
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 22 | 0 |
| 1977 | 16 | 0 |
| 1978 | 19 | 0 |
| 1979 | 22 | 0 |
| 1980 | 15 | 0 |
| 1981 | 13 | 0 |
| 1982 | 20 | 0 |
| 1983 | 13 | 0 |
| 1984 | 10 | 0 |
| 1985 | 12 | 0 |
| 1986 | 10 | 0 |
| 1987 | 17 | 0 |
| 1988 | 13 | 0 |
| 1989 | 9 | 0 |
| 1990 | 7 | 0 |
| 1991 | 12 | 0 |
| 1992 | 11 | 0 |
| 1993 | 9 | 0 |
| 1994 | 18 | 0 |
| 1995 | 10 | 0 |
| 1996 | 10 | 0 |
| 1997 | 7 | 0 |
| 1998 | 22 | 0 |
| 1999 | 16 | 0 |
| 2000 | 30 | 0 |
| 2001 | 37 | 7 |
| 2002 | 31 | 18 |
| 2003 | 22 | 40 |
| 2004 | 35 | 27 |
| 2005 | 33 | 30 |
| 2006 | 19 | 26 |
| 2007 | 23 | 27 |
| 2008 | 16 | 24 |
| 2009 | 16 | 21 |
| 2010 | 17 | 15 |
| 2011 | 19 | 19 |
| 2012 | 12 | 15 |
| 2013 | 14 | 28 |
| 2014 | 10 | 26 |
| 2015 | 21 | 26 |
| 2016 | 18 | 23 |
| 2017 | 23 | 26 |
| 2018 | 25 | 38 |
| 2019 | 36 | 37 |
| 2020 | 40 | 49 |
| 2021 | 47 | 52 |
| 2022 | 38 | 40 |
| 2023 | 43 | 38 |
| 2024 | 42 | 35 |
| 2025 | 44 | 48 |
| 2026 | 23 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and system for a flow-isolated valve arrangement and a three-chamber cylinder hydraulic architecture1 Sep 2026US 12,723,603 B2Purdue Research Foundation
- Hydraulic jack assemblies28 Jul 2026US 12,692,139 B2
- Hydraulic machine swing system with anti-drift9 Jun 2026US 12,650,003 B2Caterpillar Inc.
- Regulator having check valve manifold for use in subsea control circuit9 Jun 2026US 12,650,052 B2National Coupling Company, Inc.
- Energy storage and reutilization for a single-rod electro-hydrostatic actuator9 Jun 2026US 12,650,138 B2University of Manitoba
- Mobile machine with improved electric powered actuator system6 Aug 2026US 2026/0226710 A1Moog Inc.
- Method and system for transferring hydraulic power between a pump and an actuator6 Aug 2026US 2026/0226926 A1Allu Innovation and Research Center Oy
- Two-way quick cylinder and wood splitter9 Jul 2026US 2026/0194080 A1
- Hydraulic System having an Inertia Charging Arrangement25 Jun 2026US 2026/0177086 A1Robert Bosch GmbH
- Submersible Hydraulic Power Units with Interchangeable Manifolds11 Jun 2026US 2026/0160275 A1
Most cited
By later US patents
- Hydraulic circuit for automatic transmission1,004US 9,488,197 B2Hyundai Motor Company · 2016
- Fail-safe actuation system926US 9,239,064 B2Moog Inc. · 2016
- Hydraulic system providing down force on a work implement109US 6,460,623 B1Caterpillar Inc. · 2002
- Hydraulic control system for downhole tools100US 6,536,530 B2Halliburton Energy Services.Inc. · 2003
- Systems and methods for energy storage and recovery using compressed gas96US 7,832,207 B2SustainX, Inc. · 2010