E02F 9/2221
Control of flow rate
Official title: {Control of flow rate; Load sensing arrangements (E02F9/2203 take precedence over E02F9/2221)}
E02F9/2221 (Control of flow rate) appears on 2,200 US grants and 2,168 published applications in this corpus.
Search patents in E02F- Granted patents
- 2,200
- Published applications
- 2,168
- Assignees
- 336
- Inventors
- 2,797
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 10 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 14 | 0 |
| 1986 | 7 | 0 |
| 1987 | 9 | 0 |
| 1988 | 13 | 0 |
| 1989 | 10 | 0 |
| 1990 | 13 | 0 |
| 1991 | 11 | 0 |
| 1992 | 29 | 0 |
| 1993 | 22 | 0 |
| 1994 | 21 | 0 |
| 1995 | 24 | 0 |
| 1996 | 18 | 0 |
| 1997 | 17 | 0 |
| 1998 | 26 | 0 |
| 1999 | 27 | 0 |
| 2000 | 30 | 0 |
| 2001 | 33 | 4 |
| 2002 | 26 | 15 |
| 2003 | 24 | 29 |
| 2004 | 23 | 22 |
| 2005 | 25 | 34 |
| 2006 | 16 | 45 |
| 2007 | 22 | 43 |
| 2008 | 21 | 36 |
| 2009 | 42 | 54 |
| 2010 | 19 | 46 |
| 2011 | 37 | 52 |
| 2012 | 30 | 58 |
| 2013 | 47 | 101 |
| 2014 | 60 | 93 |
| 2015 | 78 | 104 |
| 2016 | 84 | 101 |
| 2017 | 100 | 97 |
| 2018 | 82 | 113 |
| 2019 | 129 | 110 |
| 2020 | 114 | 135 |
| 2021 | 146 | 187 |
| 2022 | 130 | 198 |
| 2023 | 126 | 145 |
| 2024 | 174 | 160 |
| 2025 | 165 | 106 |
| 2026 | 104 | 80 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Construction assist system for shovel6 Oct 2026US 12,753,577 B2Sumitomo Heavy Industries, Ltd.
- Work vehicle, method of controlling work vehicle, and controller for work vehicle22 Sep 2026US 12,742,301 B2Kubota Corporation
- Construction machine22 Sep 2026US 12,742,307 B2Hitachi Construction Machinery Co., Ltd.
- Implement metering control22 Sep 2026US 12,742,310 B2Caterpillar Inc.
- Construction machine15 Sep 2026US 12,735,869 B2Hd Construction Equipment Co., Ltd.
- Work Machine8 Oct 2026US 2026/0308880 A1Hitachi Construction Machinery Co., Ltd.
- Hydraulic arrangement for supplying construction machines with a pressure medium, and construction machine8 Oct 2026US 2026/0308883 A1BAUER Maschinen GmbH
- Hydraulic system for a vehicle1 Oct 2026US 2026/0296861 A1Oshkosh Corporation
- Working machine control method, working machine control program, working machine control system, and working machine1 Oct 2026US 2026/0297902 A1Yanmar Holdings Co., Ltd.
- Loader with improved arm path24 Sep 2026US 2026/0286644 A1Great Plains Manufacturing, Inc.
Most cited
By later US patents
- Electronic control for a two-axis work implement115US 6,233,511 B1Case Corporation · 2001
- Drive system for construction machinery and method of controlling hydraulic circuit means thereof111US 4,369,625 AHitachi Construction Machinery Co., Ltd. · 1983
- Radial piston pump assemblies and use thereof in hydraulic circuits95US 10,125,750 B2HUSCO International, Inc. · 2018
- Drive device of working machine84US 6,666,022 B1Kobelco Construction Machinery Co., Ltd. · 2003
- Tool recognition and control system for a work machine82US 6,542,789 B2Caterpillar Inc. · 2003