F15B 21/08
Servomotor systems incorporating electrically operated control means
Official title: Servomotor systems incorporating electrically operated control means (F15B21/02, {F15B21/065} take precedence)
F15B21/08 (Servomotor systems incorporating electrically operated control means) appears on 877 US grants and 847 published applications in this corpus.
Search patents in F15B- Granted patents
- 877
- Published applications
- 847
- Assignees
- 381
- Inventors
- 1,879
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 6 | 0 |
| 1986 | 7 | 0 |
| 1987 | 5 | 0 |
| 1988 | 7 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 8 | 0 |
| 1993 | 7 | 0 |
| 1994 | 4 | 0 |
| 1995 | 7 | 0 |
| 1996 | 14 | 0 |
| 1997 | 13 | 0 |
| 1998 | 4 | 0 |
| 1999 | 11 | 0 |
| 2000 | 7 | 0 |
| 2001 | 24 | 6 |
| 2002 | 21 | 18 |
| 2003 | 13 | 22 |
| 2004 | 22 | 23 |
| 2005 | 16 | 25 |
| 2006 | 19 | 24 |
| 2007 | 26 | 29 |
| 2008 | 18 | 18 |
| 2009 | 19 | 25 |
| 2010 | 7 | 26 |
| 2011 | 17 | 28 |
| 2012 | 21 | 23 |
| 2013 | 27 | 17 |
| 2014 | 29 | 27 |
| 2015 | 14 | 22 |
| 2016 | 21 | 31 |
| 2017 | 22 | 19 |
| 2018 | 24 | 51 |
| 2019 | 34 | 56 |
| 2020 | 57 | 49 |
| 2021 | 47 | 61 |
| 2022 | 54 | 54 |
| 2023 | 51 | 62 |
| 2024 | 55 | 60 |
| 2025 | 58 | 45 |
| 2026 | 28 | 26 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
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
- Hydraulic tools, systems for tools, and methods of use or control of same30 Jun 2026US 12,669,139 B2Huskie Tools, Inc.
- Drive control device for rotating work machine and rotating work machine provided with same16 Jun 2026US 12,655,607 B2Kobelco Construction Machinery Co., Ltd.
- 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
- Systems and methods for energy storage and recovery using compressed gas96US 7,832,207 B2SustainX, Inc. · 2010
- Hydraulic system with cross function regeneration90US 6,502,393 B1HUSCO International, Inc. · 2003
- System and method for controlling an independent metering valve77US 5,960,695 ACaterpillar Inc. · 1999
- Systems and methods for energy storage and recovery using rapid isothermal gas expansion and compression73US 7,874,155 B2SustainX, Inc. · 2011