E21D 23/006
Provided with essential hydraulic devices
Official title: {provided with essential hydraulic devices}
E21D23/006 (Provided with essential hydraulic devices) appears on 14 US grants and 14 published applications in this corpus.
Search patents in E21D- Granted patents
- 14
- Published applications
- 14
- Assignees
- 11
- Inventors
- 44
- Latest grant
- 8 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 1 | 1 |
| 2017 | 0 | 2 |
| 2018 | 2 | 0 |
| 2019 | 1 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 1 |
| 2022 | 1 | 2 |
| 2023 | 2 | 4 |
| 2024 | 3 | 1 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hydraulic support with quick response function for coal wall spalling8 Jul 2025US 12,352,169 B2Shandong University of Science and Technology
- Mining shield base lift methods12 Nov 2024US 12,138,721 B2
- Mining shield base lift wear pad1 Oct 2024US 12,103,124 B2
- Distributed coal cutting device for longwall face of coal mine30 Jul 2024US 12,049,824 B2
- Mining shield base lift apparatuses and methods3 Oct 2023US 11,772,209 B1Swanson Industries, Inc.
- Underground mining system and method30 Jul 2026US 2026/0218612 A1
- Hydraulic Support with Quick Response Function for Coal Wall Spalling25 Jan 2024US 2024/0026788 A1Shandong University of Science and Technology
- Mining shield base lift methods21 Dec 2023US 2023/0405740 A1Swanson Industries, Inc.
- Mining shield base lift wear pad21 Dec 2023US 2023/0405741 A1Swanson Industries, Inc.
- Mining shield base lift apparatuses and methods26 Oct 2023US 2023/0339051 A1Swanson Industries, Inc.
Most cited
By later US patents
- Mine roof support assembly8US 4,526,495 AGewerkschaft Eisenhutte Westfalia · 1985
- Hydraulic assembly for a mining system2US 9,982,799 B2Caterpillar Global Mining Europe GmbH · 2018
- Longwall optimization control1US 10,208,592 B2Joy Global Underground Mining LLC · 2019
- Mining shield base lift apparatuses and methods1US 11,772,209 B1Swanson Industries, Inc. · 2023
- Heading shield1US 4,420,278 ADowty (South Africa) (Proprietary) Limited · 1983