F15B 21/087
Control strategy
Official title: {Control strategy, e.g. with block diagram}
F15B21/087 (Control strategy) appears on 502 US grants and 455 published applications in this corpus.
Search patents in F15B- Granted patents
- 502
- Published applications
- 455
- Assignees
- 221
- Inventors
- 1,095
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 5 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 5 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 5 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 9 | 0 |
| 1997 | 8 | 0 |
| 1998 | 3 | 0 |
| 1999 | 9 | 0 |
| 2000 | 4 | 0 |
| 2001 | 16 | 4 |
| 2002 | 14 | 5 |
| 2003 | 4 | 8 |
| 2004 | 9 | 10 |
| 2005 | 8 | 11 |
| 2006 | 7 | 9 |
| 2007 | 11 | 13 |
| 2008 | 9 | 7 |
| 2009 | 12 | 8 |
| 2010 | 1 | 11 |
| 2011 | 7 | 9 |
| 2012 | 5 | 10 |
| 2013 | 9 | 7 |
| 2014 | 17 | 8 |
| 2015 | 5 | 2 |
| 2016 | 5 | 13 |
| 2017 | 10 | 11 |
| 2018 | 7 | 25 |
| 2019 | 22 | 35 |
| 2020 | 29 | 28 |
| 2021 | 32 | 45 |
| 2022 | 38 | 41 |
| 2023 | 39 | 39 |
| 2024 | 41 | 49 |
| 2025 | 39 | 30 |
| 2026 | 21 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Work machine accessory motor load protection8 Sep 2026US 12,729,699 B2Caterpillar Inc.
- Hydraulic drive device18 Aug 2026US 12,710,061 B2Kawasaki Jukogyo Kabushiki Kaisha
- Systems and methods for synchronized valve actuation28 Jul 2026US 12,693,691 B2Swagelok Company
- Drive control device for rotating work machine and rotating work machine provided with same16 Jun 2026US 12,655,607 B2Kobelco Construction Machinery Co., Ltd.
- Volume follow supply9 Jun 2026US 12,650,135 B2Hydac Fluidtechnik GmbH
- Hydraulic system management method for machine control13 Aug 2026US 2026/0234895 A1Deere & Company
- Load dampening system13 Aug 2026US 2026/0235142 A1J. C. Bamford Excavators Limited
- Actuator system, aircraft, and method6 Aug 2026US 2026/0226925 A1Liebherr-Aerospace Lindenberg GmbH
- Operator group, especially for an operator vehicle25 Jun 2026US 2026/0176118 A1Manitou Italia S.R.L.
- Systems and methods for configuring actuators of a marine vessel11 Jun 2026US 2026/0159203 A1Navico Group Americas, LLC
Most cited
By later US patents
- Hydraulic circuit and control system therefor115US 5,138,838 ACaterpillar Inc. · 1992
- System and method for controlling an independent metering valve77US 5,960,695 ACaterpillar Inc. · 1999
- Electrohydraulic system and apparatus with bidirectional electric-motor/hydraulic-pump unit69US 5,778,671 AVickers, Incorporated · 1998
- Control system for load-sensing hydraulic drive circuit65US 4,967,557 AHitachi Construction Machinery Co., Ltd. · 1990
- Electrically controlled auxiliary hydraulic system for a skid steer loader61US 4,949,805 AClark Equipment Company · 1990