E21D 23/0017
Pile type supports
Official title: {Pile type supports}
E21D23/0017 (Pile type supports) appears on 26 US grants and 3 published applications in this corpus.
Search patents in E21D- Granted patents
- 26
- Published applications
- 3
- Assignees
- 16
- Inventors
- 50
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 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 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Asymmetric hydraulic supports for pseudo inclined mining in steeply dipping seam13 Jan 2026US 12,523,151 B2XI'AN UNIVERSITY OF SCIENCE AND TECHNOLOGY Xi'an, China
- Longwall mining roof supports6 Jun 2017US 9,670,777 B2Joy MM Delaware, Inc.
- Longwall mining roof supports26 Nov 2013US 8,590,982 B2Joy MM Delaware, Inc.
- Roof support for underground excavations such as coal mines12 Jan 1993US 5,178,494 AVoest-Alpine Bergtechnik Gesellschaft m.b.H.
- Mobile stope support apparatus28 Jul 1992US 5,133,626 ACrucible Inc.
- Asymmetric hydraulic supports for pseudo inclined mining in steeply dipping seam10 Apr 2025US 2025/0116192 A1Xi'an University of Science and Technology
- Longwall mining roof supports20 Mar 2014US 2014/0077580 A1Joy MM Delaware, Inc.
- Longwall mining roof supports13 Jan 2011US 2011/0006586 A1Joy MM Delaware, Inc.
Most cited
By later US patents
- Mine roof support assembly20US 4,217,067 AGewerkschaft Eisenhutte Westfalia · 1980
- Mine roof support and method in longwall mining of thick mineral seams17US 4,065,929 AAtlantic Richfield Company · 1978
- Mine roof support14US 4,010,618 ADowty Mining Equipment Limited · 1977
- Method and apparatus for supporting the roof of an underground mine working14US 4,099,785 A1978
- Mine roof support assembly8US 4,526,495 AGewerkschaft Eisenhutte Westfalia · 1985