E21D 23/0427
Shield operating devices
Official title: {Shield operating devices; Hinges therefor}
E21D23/0427 (Shield operating devices) appears on 32 US grants and 3 published applications in this corpus.
Search patents in E21D- Granted patents
- 32
- Published applications
- 3
- Assignees
- 20
- Inventors
- 69
- Latest grant
- 8 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 4 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 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 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Hydraulic support with quick response function for coal wall spalling8 Jul 2025US 12,352,169 B2Shandong University of Science and Technology
- Distributed coal cutting device for longwall face of coal mine30 Jul 2024US 12,049,824 B2
- Self-moving tunnel support canopy22 Mar 2016US 9,291,053 B2
- Mining roof support11 Nov 1997US 5,685,669 AFabryka Maszyn"Glinik" S.A.
- Roof supports9 May 1989US 4,828,433 AGewerkschaft Eisenhutte Westfalia
- Hydraulic Support with Quick Response Function for Coal Wall Spalling25 Jan 2024US 2024/0026788 A1Shandong University of Science and Technology
- Distributed coal cutting device for longwall face of coal mine26 Oct 2023US 2023/0340877 A1Henan Polytechnic University
- Self-moving tunnel support canopy26 Mar 2015US 2015/0086272 A1
Most cited
By later US patents
- Support assemblies for use in mine workings12US 4,048,804 AGewerkschaft Eisenhutte Westfalia · 1977
- Shield structure10US 4,020,640 AVereinigte Osterreichische Eisen- und Stahlwerke-Alpine Montan Aktiengesellschaft · 1977
- Shield timbering frame for timbering mines10US 4,236,850 AThyssen Industrie AG · 1980
- Hydraulic mine-roof support7US 4,474,510 AHermann Hemscheidt Maschinenfabrik GmbH & Co. · 1984
- Excavation-roof support6US 3,959,976 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1976