F15B 13/0438
The pilot valves being of the nozzle-flapper type
Official title: {the pilot valves being of the nozzle-flapper type}
F15B13/0438 (The pilot valves being of the nozzle-flapper type) appears on 145 US grants and 116 published applications in this corpus.
Search patents in F15B- Granted patents
- 145
- Published applications
- 116
- Assignees
- 76
- Inventors
- 249
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 5 | 3 |
| 2003 | 1 | 0 |
| 2004 | 2 | 2 |
| 2005 | 1 | 2 |
| 2006 | 3 | 1 |
| 2007 | 3 | 4 |
| 2008 | 1 | 0 |
| 2009 | 2 | 5 |
| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
| 2012 | 1 | 2 |
| 2013 | 0 | 2 |
| 2014 | 0 | 1 |
| 2015 | 1 | 6 |
| 2016 | 4 | 5 |
| 2017 | 4 | 6 |
| 2018 | 1 | 14 |
| 2019 | 7 | 18 |
| 2020 | 13 | 22 |
| 2021 | 18 | 6 |
| 2022 | 9 | 4 |
| 2023 | 7 | 6 |
| 2024 | 6 | 3 |
| 2025 | 6 | 3 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Variable dither control system for a fluid actuator25 Aug 2026US 12,716,516 B2Hamilton Sundstrand Corporation
- Single stage servo valve assembly28 Apr 2026US 12,612,977 B2Hamilton Sundstrand Corporation
- Valve and aircraft25 Nov 2025US 12,480,534 B2Liebherr-Aerospace Lindenberg GmbH
- Two-stage servo valve21 Oct 2025US 12,448,990 B2Goodrich Actuation Systems Limited
- Valve and aircraft23 Sep 2025US 12,421,986 B2Liebherr-Aerospace Lindenberg GmbH
- Single stage servo valve assembly1 May 2025US 2025/0137547 A1Hamilton Sundstrand Corporation
- Parallel electrohydraulic servo valve controlled actuator with failure accommodation24 Apr 2025US 2025/0129807 A1Hamilton Sundstrand Corporation
- Fluid system with multi-mode transfer valve27 Feb 2025US 2025/0067284 A1Rtx Corporation
- Two-stage servo valve27 Jun 2024US 2024/0209875 A1Goodrich Actuation Systems Limited
- Valve and aircraft1 Feb 2024US 2024/0035492 A1Liebherr-Aerospace Lindenberg GmbH
Most cited
By later US patents
- Proportional and latching pressure control device55US 4,605,197 AFema Corporation · 1986
- Valve means46US 6,499,509 B2Festo AG & Co. · 2002
- Thermally actuated microvalve device39US 6,845,962 B1Kelsey-Hayes Company · 2005
- Electrofluidic transducer of the nozzle/plate type and hydraulic servo-valve equipped with such a transducer34US 4,705,059 ACentre Technique des Industries Mecaniques · 1987
- Hydraulic valves34US 5,806,565 AMicrohydraulics, Inc. · 1998