F15
Fluid-pressure actuators
Official title: Fluid-pressure actuators; hydraulics or pneumatics in general
F15 (Fluid-pressure actuators) appears on 20,049 US grants and 16,069 published applications in this corpus.
Search patents in F15- Granted patents
- 20,049
- Published applications
- 16,069
- Assignees
- 6,096
- Inventors
- 29,680
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 349 | 0 |
| 1977 | 219 | 0 |
| 1978 | 236 | 0 |
| 1979 | 166 | 0 |
| 1980 | 246 | 0 |
| 1981 | 233 | 0 |
| 1982 | 206 | 0 |
| 1983 | 156 | 0 |
| 1984 | 205 | 0 |
| 1985 | 270 | 0 |
| 1986 | 216 | 0 |
| 1987 | 240 | 0 |
| 1988 | 232 | 0 |
| 1989 | 250 | 0 |
| 1990 | 173 | 0 |
| 1991 | 247 | 0 |
| 1992 | 209 | 0 |
| 1993 | 218 | 0 |
| 1994 | 260 | 0 |
| 1995 | 227 | 0 |
| 1996 | 244 | 0 |
| 1997 | 245 | 0 |
| 1998 | 302 | 0 |
| 1999 | 369 | 0 |
| 2000 | 348 | 0 |
| 2001 | 436 | 111 |
| 2002 | 422 | 378 |
| 2003 | 422 | 443 |
| 2004 | 403 | 474 |
| 2005 | 362 | 451 |
| 2006 | 359 | 438 |
| 2007 | 306 | 432 |
| 2008 | 274 | 449 |
| 2009 | 254 | 459 |
| 2010 | 287 | 516 |
| 2011 | 311 | 451 |
| 2012 | 336 | 551 |
| 2013 | 452 | 739 |
| 2014 | 480 | 743 |
| 2015 | 600 | 850 |
| 2016 | 653 | 826 |
| 2017 | 748 | 841 |
| 2018 | 768 | 985 |
| 2019 | 955 | 964 |
| 2020 | 1003 | 1008 |
| 2021 | 907 | 854 |
| 2022 | 799 | 717 |
| 2023 | 642 | 707 |
| 2024 | 692 | 681 |
| 2025 | 689 | 592 |
| 2026 | 423 | 409 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subclasses
Granted patents
Recent patents
- Systems, devices, and methods for a hydraulic robotic arm6 Oct 2026US 12,752,419 B2Sanctuary Cognitive Systems Corporation
- Vehicle suspension system with roll moment distribution control6 Oct 2026US 12,752,583 B2Advanced Suspension Technology LLC
- Jack with hydraulic lock6 Oct 2026US 12,753,053 B2Pacific Rim International, LLC
- Construction machine6 Oct 2026US 12,753,569 B2Hitachi Construction Machinery Co., Ltd.
- System for returning fluid from hydraulic devices of work machines6 Oct 2026US 12,753,579 B2Caterpillar Inc.
- Slewing drive for a loading and/or unloading apparatus, loading and/or unloading apparatus with a slewing drive, tire-heating press and method for handling tires8 Oct 2026US 2026/0307349 A1Harburg-Freudenberger Maschinenbau GmbH
- Work Machine8 Oct 2026US 2026/0308879 A1Hitachi Construction Machinery Co., Ltd.
- Reinforcement assembly for gas turbine bearing housing8 Oct 2026US 2026/0309049 A1
- Method for Detecting Cavitation and/or a Bubbling-in or Inflow of Air within a Hydraulic System8 Oct 2026US 2026/0309158 A1KSB SE & Co. KGaA
- Weld cap and plug welds for fluid delivery systems8 Oct 2026US 2026/0309168 A1Compart Systems Pte. Ltd.
Most cited
By later US patents
- Pneumatic telescoping cylinder and method1,499US 5,341,724 A1994
- Self-induction-type stroke sensor1,339US 6,512,360 B1Amiteq Co., Ltd. · 2003
- Magnetic position sensor for measuring linear displacement1,173US 6,670,806 B2Koninklijke Philips Electronics N. V. · 2003
- Pneumatically operated mechanism1,103US 6,050,172 AEmhart Glass S. A. · 2000
- Piston-cylinder assembly1,065US 4,896,584 A1990