E21D 15/02
Non-telescopic props
E21D15/02 (Non-telescopic props) appears on 27 US grants and 15 published applications in this corpus.
Search patents in E21D- Granted patents
- 27
- Published applications
- 15
- Assignees
- 24
- Inventors
- 49
- Latest grant
- 26 Apr 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 2 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 3 |
| 2021 | 4 | 0 |
| 2022 | 1 | 0 |
| 2023 | 0 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Internally injected replacement support room-type coal pillar recovery method26 Apr 2022US 11,313,226 B2China University of Mining and Technology
- Underground support28 Sep 2021US 11,131,189 B2FCI Holdings Delaware, Inc.
- Top plate for cribbing stacks and associated methods25 May 2021US 11,015,316 B1Cleveland Reclaim Industries
- Equipment system for no-roadway no-coal-pillar retained roadway mining method18 May 2021US 11,008,860 B2Manchao HE
- Mine roof support5 Jan 2021US 10,883,366 B2Crosscut Enterprises LLC
- A multichamber structural element and a multichamber structural element manufacturing method9 Feb 2023US 2023/0037963 A1Instytut Formy Sp. Z O.O.
- Internally injected replacement support room-type coal pillar recovery method3 Dec 2020US 2020/0378255 A1China University of Mining and Technology
- Underground Support4 Jun 2020US 2020/0173280 A1FCI Holdings Delaware, Inc.
- Mine roof support30 Apr 2020US 2020/0131905 A1Crosscut Enterprises LLC
- Apparatus and method for pre-loading mechanical constant-resistance single prop21 Mar 2019US 2019/0085690 A1China University of Mining and Technology
Most cited
By later US patents
- Supporting of excavation roofs34US 4,255,071 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1981
- Method and system for supporting a roof23US 4,185,940 A1980
- Excavation roof support and method of installing the same18US 4,277,204 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1981
- Mine support prop14US 4,712,947 AHunt Leuchars and Hepburn Limited · 1987
- Cribbing13US 4,497,597 ACommercial Shearing, Inc. · 1985