F16D 2048/0257
Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement
Official title: {Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof}
F16D2048/0257 (Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement) appears on 394 US grants and 340 published applications in this corpus.
Search patents in F16D- Granted patents
- 394
- Published applications
- 340
- Assignees
- 169
- Inventors
- 831
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 5 | 0 |
| 1985 | 8 | 0 |
| 1986 | 8 | 0 |
| 1987 | 11 | 0 |
| 1988 | 2 | 0 |
| 1989 | 10 | 0 |
| 1990 | 3 | 0 |
| 1991 | 9 | 0 |
| 1992 | 9 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 3 |
| 2002 | 7 | 0 |
| 2003 | 4 | 6 |
| 2004 | 4 | 10 |
| 2005 | 5 | 5 |
| 2006 | 8 | 13 |
| 2007 | 4 | 11 |
| 2008 | 8 | 9 |
| 2009 | 6 | 14 |
| 2010 | 5 | 3 |
| 2011 | 7 | 16 |
| 2012 | 6 | 34 |
| 2013 | 17 | 34 |
| 2014 | 35 | 23 |
| 2015 | 26 | 14 |
| 2016 | 21 | 26 |
| 2017 | 26 | 16 |
| 2018 | 16 | 20 |
| 2019 | 16 | 15 |
| 2020 | 23 | 19 |
| 2021 | 11 | 12 |
| 2022 | 16 | 11 |
| 2023 | 9 | 11 |
| 2024 | 12 | 9 |
| 2025 | 5 | 3 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F16D 2048/0281Complex circuits with more than two valves in series or special arrangementsIndexing code111
- F16D 2048/0287Hydraulic circuits combining clutch actuation and other hydraulic systemsIndexing code103
- F16D 2048/0266Actively controlled valves between pressure source and actuation cylinderIndexing code80
- F16D 2048/0269Single valve for switching between fluid supply to actuation cylinder or drainingIndexing code49
- F16D 2048/0263Passive valves between pressure source and actuating cylinderIndexing code47
- F16D 2048/0284Characterised by valve arrangements supplying fluid to a two chamber- cylinderIndexing code33
- F16D 2048/0278Two valves in series arrangement for controlling supply to actuation cylinderIndexing code31
- F16D 2048/0275Two valves arranged in parallelIndexing code28
All 11 subgroupsShow fewer
- F16D 2048/0272Two valves, where one valve is supplying fluid to the cylinder andIndexing code19
- F16D 2048/026The controlling actuation is directly performed by the pressure source, i.e. thereIndexing code10
- F16D 2048/0296Hydraulic circuits controlled exclusively by hydraulic pressure, i.e. with no electrically controlledIndexing code4
Recent patents
- Clutch system7 Apr 2026US 12,595,827 B2Isuzu Motors Limited
- Pressure modulating clutch control assembly17 Mar 2026US 12,577,991 B2Caterpillar Inc.
- Method for detecting a safe state of a valve of a hydraulic system17 Feb 2026US 12,552,340 B2Schaeffler Technologies AG & Co. KG
- Methods and systems for improving the operation of transmissions for motor vehicles7 Oct 2025US 12,435,786 B2Transgo, LLC
- Propulsion and braking system using clutch5 Aug 2025US 12,379,005 B2Stxengine Co., Ltd
- Hydraulic system, hybrid transmission, and vehicle10 Sep 2026US 2026/0266342 A1Chery Automobile Co., Ltd.
- High-pressure hydraulic clutch cooling system for work vehicles30 Jul 2026US 2026/0218761 A1Deere & Company
- Clutch system12 Feb 2026US 2026/0043442 A1Isuzu Motors Limited
- Pressure modulating clutch control assembly18 Dec 2025US 2025/0382995 A1Caterpillar Inc.
- Method for detecting a safe state of a valve of a hydraulic system30 Oct 2025US 2025/0333014 A1Schaeffler Technologies AG & Co. KG
Most cited
By later US patents
- Hydraulic circuit for automatic transmission1,004US 9,488,197 B2Hyundai Motor Company · 2016
- Belt type continuous reduction gear mechanism147US 4,560,369 AHonda Giken Kogyo Kabushiki Kaisha · 1985
- Method and apparatus for determining the position of an armature in an electromagnetic actuator83US 5,481,187 ACaterpillar Inc. · 1996
- Method and apparatus for determining the position of an armature in an electromagnetic actuator by measuring the driving voltage frequency77US 5,600,237 ACaterpillar Inc. · 1997
- Electronic control system for powershift transmission69US 4,855,913 AJ. I. Case Company · 1989