E02F 9/2278
Hydraulic circuits
Official title: {Hydraulic circuits}
E02F9/2278 (Hydraulic circuits) appears on 2,528 US grants and 2,603 published applications in this corpus.
Search patents in E02F- Granted patents
- 2,528
- Published applications
- 2,603
- Assignees
- 326
- Inventors
- 3,100
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 8 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 11 | 0 |
| 1986 | 6 | 0 |
| 1987 | 5 | 0 |
| 1988 | 11 | 0 |
| 1989 | 7 | 0 |
| 1990 | 9 | 0 |
| 1991 | 13 | 0 |
| 1992 | 25 | 0 |
| 1993 | 18 | 0 |
| 1994 | 20 | 0 |
| 1995 | 18 | 0 |
| 1996 | 17 | 0 |
| 1997 | 18 | 0 |
| 1998 | 25 | 0 |
| 1999 | 38 | 0 |
| 2000 | 37 | 0 |
| 2001 | 41 | 3 |
| 2002 | 31 | 20 |
| 2003 | 34 | 33 |
| 2004 | 20 | 21 |
| 2005 | 21 | 28 |
| 2006 | 18 | 42 |
| 2007 | 28 | 45 |
| 2008 | 21 | 52 |
| 2009 | 44 | 62 |
| 2010 | 21 | 51 |
| 2011 | 44 | 50 |
| 2012 | 31 | 75 |
| 2013 | 48 | 145 |
| 2014 | 101 | 152 |
| 2015 | 116 | 169 |
| 2016 | 126 | 165 |
| 2017 | 162 | 134 |
| 2018 | 120 | 121 |
| 2019 | 147 | 105 |
| 2020 | 124 | 147 |
| 2021 | 141 | 206 |
| 2022 | 140 | 219 |
| 2023 | 143 | 143 |
| 2024 | 192 | 171 |
| 2025 | 177 | 136 |
| 2026 | 115 | 108 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Construction machine6 Oct 2026US 12,753,569 B2Hitachi Construction Machinery Co., Ltd.
- Adaptive eco mode6 Oct 2026US 12,753,573 B2Deere & Company
- Work machine and method for controlling work machine6 Oct 2026US 12,753,574 B2Komatsu Ltd.
- Construction assist system for shovel6 Oct 2026US 12,753,577 B2Sumitomo Heavy Industries, Ltd.
- System for returning fluid from hydraulic devices of work machines6 Oct 2026US 12,753,579 B2Caterpillar Inc.
- Work Machine8 Oct 2026US 2026/0308879 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
- Construction machine8 Oct 2026US 2026/0308886 A1Kobelco Construction Machinery Co., Ltd.
- Hydraulic System8 Oct 2026US 2026/0309169 A1Caterpillar SARL
- Working machine control method, working machine control program, working machine control system, and working machine1 Oct 2026US 2026/0297902 A1Yanmar Holdings Co., Ltd.
Most cited
By later US patents
- Three-parameter optical fiber sensor and system497US 4,986,671 ALuxtron Corporation · 1991
- Drive system for construction machinery and method of controlling hydraulic circuit means thereof111US 4,369,625 AHitachi Construction Machinery Co., Ltd. · 1983
- Remote radio operating system, and remote operating apparatus, mobile relay station and radio mobile working machine92US 6,778,097 B1Shin Caterpillar Mitsubishi Ltd. · 2004
- Hydraulic system with cross function regeneration90US 6,502,393 B1HUSCO International, Inc. · 2003
- Construction equipment79US 6,725,581 B2Komatsu Ltd. · 2004